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.

A239817 Number of n X 6 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 A239817 #8 Jun 19 2025 22:46:39
%S A239817 132,21602,2912793,418324402,58232200212,8243207656791,
%T A239817 1154988223050638,162794110794893005,22871029907841066549,
%U A239817 3218700464551459701771,452563580936326395762181,63663914001474387730433692
%N A239817 Number of n X 6 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 A239817 Column 6 of A239819.
%H A239817 R. H. Hardin, <a href="/A239817/b239817.txt">Table of n, a(n) for n = 1..210</a>
%e A239817 Some solutions for n=2
%e A239817 ..3..0..2..0..2..2....2..0..3..2..2..3....2..3..3..2..0..3....3..0..2..0..3..3
%e A239817 ..1..2..2..0..2..1....1..3..2..0..0..1....2..1..1..2..3..3....3..2..0..2..1..1
%Y A239817 Cf. A239819.
%K A239817 nonn
%O A239817 1,1
%A A239817 _R. H. Hardin_, Mar 27 2014