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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.

A229771 Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.

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%I A229771 #6 Jul 23 2025 05:46:32
%S A229771 4,60,3232,1058494,3062815568,90462380211862,29201160476766771330,
%T A229771 108134253835820664368578112
%N A229771 Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.
%C A229771 Column 3 of A229774
%e A229771 Some solutions for n=3
%e A229771 ..1..1..0....2..1..1....1..1..0....1..0..0....2..1..0....1..0..0....1..1..0
%e A229771 ..1..1..1....3..3..0....1..1..2....1..1..1....3..0..2....2..1..0....2..1..0
%e A229771 ..1..1..1....3..3..1....3..2..0....2..3..0....3..0..3....3..1..2....2..1..2
%K A229771 nonn
%O A229771 1,1
%A A229771 _R. H. Hardin_, Sep 29 2013

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