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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.

A216758 Number of horizontal, vertical, diagonal, antidiagonal or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order.

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%I A216758 #6 Jul 22 2025 23:35:02
%S A216758 2,4,60,2957,337731,71786149,24889021634,12901134791995
%N A216758 Number of horizontal, vertical, diagonal, antidiagonal or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order.
%C A216758 Column 3 of A216760
%e A216758 Some solutions for n=4
%e A216758 ..0..1..0....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
%e A216758 ..2..3..4....3..4..5....3..4..5....3..4..3....3..4..5....3..4..5....3..4..5
%e A216758 ..5..1..6....6..1..7....0..6..2....2..5..2....2..1..6....2..6..2....6..7..2
%e A216758 ..7..0..2....0..8..3....7..1..3....1..0..1....5..7..0....5..0..5....8..4..8
%K A216758 nonn
%O A216758 1,1
%A A216758 _R. H. Hardin_ Sep 15 2012

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