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.

A240795 Number of 4Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the 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 A240795 #6 Jun 02 2025 10:00:22
%S A240795 7,10,27,37,132,552,2277,11588,35799,109054,467005,1826688,8078985,
%T A240795 27489845,92673526,369573835,1387676052,5728088537,20522163467,
%U A240795 72766642122,281548168173,1050333422732,4157767214229,15271536502557
%N A240795 Number of 4Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the 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 A240795 Row 4 of A240792
%H A240795 R. H. Hardin, <a href="/A240795/b240795.txt">Table of n, a(n) for n = 1..151</a>
%e A240795 Some solutions for n=4
%e A240795 ..3..2..3..2....3..2..3..2....3..2..3..2....3..2..3..2....3..2..3..2
%e A240795 ..3..2..3..2....3..2..1..1....3..2..1..2....3..2..1..1....3..2..1..1
%e A240795 ..2..0..0..2....2..2..3..1....2..2..0..2....2..2..3..1....2..2..3..2
%e A240795 ..2..0..1..2....3..1..2..2....3..1..3..2....3..1..3..2....3..1..3..1
%K A240795 nonn
%O A240795 1,1
%A A240795 _R. H. Hardin_, Apr 12 2014