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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.

A223055 Number of n X n 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.

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%I A223055 #7 Jul 23 2025 03:26:30
%S A223055 1,10,4865,31331820,2266567594841,1837966217755803448,
%T A223055 16700483735732492103987445,1700203937054371815103811136350852
%N A223055 Number of n X n 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.
%C A223055 Diagonal of A223062
%e A223055 Some solutions for n=3
%e A223055 ..0..1..0....0..1..2....0..0..1....0..1..2....0..0..1....0..1..2....0..1..2
%e A223055 ..2..2..1....3..1..3....1..2..3....2..2..0....2..3..1....2..0..0....2..0..3
%e A223055 ..1..3..0....3..2..3....1..3..2....1..1..1....3..0..2....0..1..3....3..1..2
%K A223055 nonn
%O A223055 1,2
%A A223055 _R. H. Hardin_ Mar 13 2013

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