A189433 Number of n X 7 array permutations with each element not moving, or moving one space N, SW or SE.

1, 21, 441, 10069, 278105, 6944573, 181540773, 4742833745, 124239687001, 3261208487441, 85625162598265, 2250063012268697, 59139108575177913, 1554641730277194809, 40872537373376873929, 1074626580793742218601

Offset: 1

Author

R. H. Hardin, Apr 22 2011

Keywords

• nonn

Comments

Column 7 of A189435.

Examples

			Some solutions for 3 X 7
..0..1..2..3..4.12..6....0..1..9.10.11..5..6....7..8..9.10..4..5.13
.14.15.16.17..5.19.13....7..8..3..2.18..4.13....1..0..3..2.11..6.20
..8..7.10..9.18.11.20...14.15.16.17.12.19.20...14.15.16.17.18.19.12
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..189

Crossrefs

Cf. A189435.