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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A221932 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.

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%I A221932 #5 Jul 23 2025 02:20:41
%S A221932 1,1367,153652,20246283,2568601026,326363935235,41397744561659,
%T A221932 5246761195398438,664828879659318271,84233175060135140710
%N A221932 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
%C A221932 Row 4 of A221929
%e A221932 Some solutions for n=3
%e A221932 ..1..1..2....1..0..1....0..2..1....1..0..2....0..1..1....1..1..2....0..0..2
%e A221932 ..0..0..1....1..1..1....0..1..2....2..0..1....0..1..1....0..0..1....0..6..0
%e A221932 ..0..3..2....0..1..1....1..1..1....0..1..0....0..2..1....1..1..4....1..1..0
%e A221932 ..0..2..0....1..3..1....0..1..2....1..2..2....2..2..1....0..1..0....0..1..1
%K A221932 nonn
%O A221932 1,2
%A A221932 _R. H. Hardin_ Feb 01 2013

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