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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.

A184555 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock summing to less than 4.

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%I A184555 #7 Jun 02 2025 03:48:24
%S A184555 50,5736,3436266,12900566348,276510402290782,35245029137091490532,
%T A184555 26246732217663407375879655,115019923806287297509943176811916,
%U A184555 2957519612846906106776158316962863659667
%N A184555 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock summing to less than 4.
%C A184555 Diagonal of A184564
%e A184555 Some solutions for 3X3
%e A184555 ..2..2..2....1..2..0....2..0..2....2..0..2....1..2..2....2..2..0....2..1..2
%e A184555 ..2..2..2....2..1..1....1..2..2....1..2..1....2..1..1....2..1..2....2..2..2
%e A184555 ..2..0..1....0..2..2....0..2..2....0..2..1....0..1..2....2..1..1....1..2..0
%K A184555 nonn
%O A184555 1,1
%A A184555 _R. H. Hardin_ Jan 17 2011

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