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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.

A223298 4X4X4 triangular graph coloring a rectangular array: number of n X n 0..9 arrays where 0..9 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 3,6 3,7 4,7 6,7 4,8 5,8 7,8 5,9 8,9 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.

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%I A223298 #7 Jul 23 2025 03:58:12
%S A223298 10,324,76788,118001928,1208825525124,82235766550254744,
%T A223298 37878775658906097327552,117618648410211422628657954648,
%U A223298 2498412967821017756764735962549014076
%N A223298 4X4X4 triangular graph coloring a rectangular array: number of n X n 0..9 arrays where 0..9 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 3,6 3,7 4,7 6,7 4,8 5,8 7,8 5,9 8,9 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.
%C A223298 Diagonal of A223305
%e A223298 Some solutions for n=3
%e A223298 ..2..5..8....1..2..4....4..1..3....7..8..4....4..7..3....8..7..6....8..4..8
%e A223298 ..0..2..4....2..4..7....1..2..4....3..4..1....5..8..4....7..6..7....4..2..4
%e A223298 ..2..0..1....4..1..4....0..1..2....4..2..4....9..5..2....4..3..6....5..4..1
%K A223298 nonn
%O A223298 1,1
%A A223298 _R. H. Hardin_ Mar 19 2013

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