cp's OEIS Frontend

A189456 Number of 8Xn array permutations with each element moving zero or one space horizontally or diagonally.

%I A189456 #7 Jul 22 2025 11:46:19
%S A189456 1,1597,250000,106834338,33995627281,12362821462925,4329976369716644,
%T A189456 1544933702911323688,548904049287782685569,195559483332882314913741,
%U A189456 69650888604936997141340729,24818320628803632672710482237
%N A189456 Number of 8Xn array permutations with each element moving zero or one space horizontally or diagonally.
%C A189456 Row 8 of A189449
%H A189456 R. H. Hardin, <a href="/A189456/b189456.txt">Table of n, a(n) for n = 1..31</a>
%e A189456 Some solutions for 8X3
%e A189456 ..0..2..1....0..1..2....0..1..2....0..2..1....0..2..1....0..2..1....0..1..2
%e A189456 ..7..4..5....3..8..5....3..4..5....3..5..4....7..5..4....3..5..4....4..3..5
%e A189456 ..6..3..8...10.11..4....6..8..7....6..7..8....6..3..8...10.11..8....6..8..7
%e A189456 ..9.14.11....9..6..7...10..9.11...13.10.11....9.10.11....9..6..7...10..9.11
%e A189456 .12.13.10...16.17.14...16.17.14...16..9.14...12.13.14...13.17.14...13.12.14
%e A189456 .16.15.17...15.12.13...15.12.13...15.12.17...19.15.17...15.12.16...19.20.17
%e A189456 .22.23.20...18.20.19...18.19.20...19.18.20...18.20.16...18.19.20...18.15.16
%e A189456 .21.18.19...22.21.23...21.22.23...21.23.22...21.22.23...22.21.23...22.21.23
%K A189456 nonn
%O A189456 1,2
%A A189456 _R. H. Hardin_ Apr 22 2011