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.

A241303 Number of nX4 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 or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

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%I A241303 #6 Jun 02 2025 10:04:36
%S A241303 6,25,74,330,1145,4499,15827,58043,209838,757771,2745263,9924295,
%T A241303 35873441,129961622,469870606,1700617363,6154480549,22269120491,
%U A241303 80588613827,291628152979,1055299289297,3818925623420,13819524339631
%N A241303 Number of nX4 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 or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.
%C A241303 Column 4 of A241306
%H A241303 R. H. Hardin, <a href="/A241303/b241303.txt">Table of n, a(n) for n = 1..210</a>
%e A241303 Some solutions for n=4
%e A241303 ..3..2..2..2....3..2..3..2....3..2..3..2....3..2..3..3....3..2..3..2
%e A241303 ..3..0..1..1....1..2..1..1....1..2..1..1....1..2..1..1....1..2..1..1
%e A241303 ..1..0..2..1....2..0..0..1....3..0..0..2....3..2..2..2....3..2..2..1
%e A241303 ..1..0..0..2....2..3..0..3....2..0..3..3....3..0..0..2....3..0..2..2
%K A241303 nonn
%O A241303 1,1
%A A241303 _R. H. Hardin_, Apr 18 2014