cp's OEIS Frontend

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.

A239818 Number of nX7 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4.

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%I A239818 #6 Jun 02 2025 09:32:21
%S A239818 312,118253,36627126,12059066460,3842974545029,1246285848518417,
%T A239818 399696014140196630,129035213192353255123,41500218830682985410810,
%U A239818 13375093569069190733883673,4305661324527210642658505946
%N A239818 Number of nX7 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4.
%C A239818 Column 7 of A239819
%H A239818 R. H. Hardin, <a href="/A239818/b239818.txt">Table of n, a(n) for n = 1..210</a>
%e A239818 Some solutions for n=2
%e A239818 ..2..0..0..0..3..2..0....2..3..3..2..0..3..0....3..0..0..0..0..2..2
%e A239818 ..1..0..0..2..2..0..3....2..1..2..2..0..2..3....3..0..0..0..2..0..0
%K A239818 nonn
%O A239818 1,1
%A A239818 _R. H. Hardin_, Mar 27 2014