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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.

A240276 Number of 6Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

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%I A240276 #5 Jun 02 2025 09:46:03
%S A240276 15,170,8353,382690,19210586,1063706501,63085436203,3958922741466,
%T A240276 259024497472292,17435614748138060
%N A240276 Number of 6Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
%C A240276 Row 6 of A240271
%e A240276 Some solutions for n=3
%e A240276 ..3..2..2....3..2..2....3..2..3....3..2..2....2..3..3....3..2..3....3..2..3
%e A240276 ..2..1..2....3..1..2....2..1..1....3..1..1....2..1..2....2..1..1....2..1..2
%e A240276 ..3..1..3....2..3..2....3..2..3....2..3..3....3..0..1....3..2..3....3..2..0
%e A240276 ..3..2..3....3..0..0....2..3..3....3..1..2....2..3..2....2..3..3....2..1..0
%e A240276 ..3..1..1....2..1..0....2..0..0....3..2..2....3..2..2....2..0..0....2..0..3
%e A240276 ..2..3..3....3..1..2....2..0..1....2..1..1....2..3..2....2..0..0....3..2..2
%K A240276 nonn
%O A240276 1,1
%A A240276 _R. H. Hardin_, Apr 03 2014

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