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.

A233233 Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

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%I A233233 #7 Jul 23 2025 07:57:24
%S A233233 1,19,18744,338046654,83262848013541,273407904115337411320,
%T A233233 11963921132630138069523033663,6976482888479442637729140675454130898
%N A233233 Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.
%C A233233 Diagonal of A233239
%e A233233 Some solutions for n=3
%e A233233 ..0..1..1....0..1..2....0..1..2....0..0..1....0..1..5....0..1..2....0..1..1
%e A233233 ..2..0..1....2..1..1....2..0..2....4..0..4....2..1..0....0..1..1....1..0..0
%e A233233 ..3..0..4....1..5..1....1..1..1....4..2..4....0..2..2....2..0..0....0..1..2
%K A233233 nonn
%O A233233 1,2
%A A233233 _R. H. Hardin_, Dec 06 2013

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