A septina ("Safety in Numbers") -- and variations

Recall that a sestina is a 39 line poem of six 6-line stanzas followed by a 3-line stanza.  The 6-line stanzas have lines that end in the same six words, following this permutation pattern:

   123456   615243   364125
   532614   451362   246531

The final stanza uses two of the six end-words in each of its three lines.  An original pattern for these was 2-5, 4-3, 6-1 but this is no longer strictly followed.

Can sestina-like patterns be extended to other numbers?  Poet and mathematician Jacques Roubaud of the OULIPO investigated this question and he considered, in particular, the problem of how to deal with the number 7 of end-words -- for 7 does not lead to a sestina-like permutation.  Rombaud circumvented the difficulty (see Oulipo Compendium -- Atlas Press, 2005) by using seven 6-line stanzas, with end-words following these arrangements:

Start with a number . . .

     April celebrates both poetry and mathematics -- this month that is the gateway to spring is also National Poetry Month and Mathematics Awareness Month (with theme "Mathematics, Statistics, and the Data Deluge").

     Last month (March 22-25), mathematics and poetry met at the DC Poetry Festival, Split this Rock where several of us gathered for a workshop, "Counting On" -- where writers were encouraged to use a number (or numbers) as a focal point for a poem. During the workshop hour, several of us picked numbers that mattered to us and started the process of forming a poem; here are lines from Sonja deVries, Yael Flusberg, Janine Harrison, Jaime Lee Jarvis, Margaret Rozga, and me.