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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.

A220803 Sum of neighbor maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal and vertical neighbors in a random 0..3 nX4 array.

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%I A220803 #5 Jul 23 2025 01:30:23
%S A220803 16,256,4096,62648,1048576,16777216,268435456,4294967296,68700598768,
%T A220803 1099511627776,17592186044416,281474976710656,4503599627370496,
%U A220803 72057490800855040,1152921504606846976
%N A220803 Sum of neighbor maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal and vertical neighbors in a random 0..3 nX4 array.
%C A220803 Column 4 of A220805
%e A220803 Some solutions for n=3
%e A220803 ..0..1..0..0....1..1..1..1....1..0..1..1....0..1..1..0....0..0..1..1
%e A220803 ..1..1..1..1....1..0..0..1....1..0..1..0....0..1..1..1....0..1..1..0
%e A220803 ..1..1..0..1....1..1..1..0....0..1..0..0....1..0..1..0....1..0..1..0
%K A220803 nonn
%O A220803 1,1
%A A220803 _R. H. Hardin_ Dec 21 2012

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