cp's OEIS Frontend

A189455 Number of 7Xn array permutations with each element moving zero or one space horizontally or diagonally.

%I A189455 #7 Jul 22 2025 11:46:11
%S A189455 1,610,50000,9712873,1467726607,248187289625,40668908306516,
%T A189455 6765736745152657,1121551510151218844,186316582712584278456,
%U A189455 30941586267382205903880,5140131519113981931817620
%N A189455 Number of 7Xn array permutations with each element moving zero or one space horizontally or diagonally.
%C A189455 Row 7 of A189449
%H A189455 R. H. Hardin, <a href="/A189455/b189455.txt">Table of n, a(n) for n = 1..140</a>
%e A189455 Some solutions for 7X3
%e A189455 ..4..1..2....0..5..2....1..0..2....1..5..2....0..2..1....0..5..2....4..0..2
%e A189455 ..3..0..5....7..3..1....4..8..5....3..0..4....7..8..5....3..4..1....3..5..1
%e A189455 .10..7..8....6..8..4....6..3..7...10..8..7...10..3..4....6.11..8....6..7..8
%e A189455 ..9..6.11....9.11.10....9.10.11....9..6.11....9..6.11....9.10..7...10..9.11
%e A189455 .16.12.14...12.14.13...12.14.13...13.17.14...12.13.14...12.14.13...12.14.13
%e A189455 .15.17.13...16.15.17...19.15.17...19.12.16...15.20.17...15.20.17...15.16.17
%e A189455 .19.18.20...18.20.19...18.20.16...18.15.20...19.18.16...18.19.16...18.19.20
%K A189455 nonn
%O A189455 1,2
%A A189455 _R. H. Hardin_ Apr 22 2011