A358713 Number of self-avoiding closed paths on an n X 7 grid which pass through four corners ((0,0), (0,6), (n-1,6), (n-1,0)).

1, 41, 1081, 26515, 674292, 17720400, 471468756, 12570253556, 335101401877, 8932110760401, 238088717357193, 6346541968642151, 169176879483125528, 4509681115981777876, 120212775466066851264, 3204464007623702644476, 85420126381414152110475, 2277010595175522782497635

Offset

2,2

Comments

Also number of self-avoiding closed paths on a 7 X n grid which pass through four corners ((0,0), (0,6), (n-1,6), (n-1,0)).

Links

Seiichi Manyama, Table of n, a(n) for n = 2..50

Crossrefs

Column k=7 of A333513.

Cf. A358698.

Sequence in context: A368809 A069362 A016093 * A130639 A196744 A196902

Adjacent sequences: A358710 A358711 A358712 * A358714 A358715 A358716

Keyword

nonn

Author

Seiichi Manyama, Nov 28 2022

Status

approved