cp's OEIS Frontend

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.

A232154 Number of n X n 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.

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%I A232154 #7 Jul 23 2025 06:55:43
%S A232154 1,18,290,7770,382996,36275078,6564512068,2246994465516,
%T A232154 1482101422338982,1881388287368571956
%N A232154 Number of n X n 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.
%C A232154 Diagonal of A232161
%e A232154 Some solutions for n=4
%e A232154 ..3..2..0..3....0..1..3..2....2..1..3..2....1..2..3..2....3..0..2..1
%e A232154 ..0..1..2..1....3..2..0..1....3..0..1..0....0..1..0..3....1..3..0..3
%e A232154 ..3..0..3..2....1..3..2..3....1..3..2..1....2..3..2..1....2..1..2..1
%e A232154 ..1..2..0..1....2..1..0..2....2..1..3..0....0..1..0..3....3..0..3..2
%K A232154 nonn
%O A232154 1,2
%A A232154 _R. H. Hardin_, Nov 19 2013

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