A293930 Number of circularly chained n X n alternating sign matrices.

1, 2, 20, 40, 3430, 6860

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Heuer, Dylan, Chelsey Morrow, Ben Noteboom, Sara Solhjem, Jessica Striker, and Corey Vorland. "Chained permutations and alternating sign matrices - Inspired by three-person chess." Discrete Mathematics 340, no. 12 (2017): 2732-2752. Also arXiv:1611.03387

Crossrefs

Cf. A005130, A293178, A293179, A293180.

Sequence in context: A073214 A293356 A269669 * A357485 A194999 A280436

Adjacent sequences: A293927 A293928 A293929 * A293931 A293932 A293933

Keyword

nonn,more

Author

N. J. A. Sloane, Oct 19 2017

Status

approved