cp's OEIS Frontend

A221691 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.

%I A221691 #6 Jul 23 2025 02:07:10
%S A221691 28,11036,2627760,659020617,164441398718,41023076707062,
%T A221691 10233875156794211,2553004334803146133,636887763097823284411,
%U A221691 158881831138559422724173,39635611567879464460692735
%N A221691 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.
%C A221691 Column 5 of A221693
%H A221691 R. H. Hardin, <a href="/A221691/b221691.txt">Table of n, a(n) for n = 1..17</a>
%e A221691 Some solutions for n=3
%e A221691 ..0..2..2..0..1....0..2..0..0..2....0..2..0..2..0....0..3..1..2..0
%e A221691 ..0..4..0..0..1....0..4..0..0..1....0..3..0..3..0....0..2..0..1..1
%e A221691 ..0..1..1..2..1....0..3..0..3..0....0..0..2..1..2....0..2..0..3..0
%K A221691 nonn
%O A221691 1,1
%A A221691 _R. H. Hardin_ Jan 22 2013