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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.

A229772 Number of n X n 0..4 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.

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%I A229772 #6 Jul 23 2025 05:46:38
%S A229772 5,135,21331,35452250,843211336888,322942973130396495,
%T A229772 2131384087795458774515411
%N A229772 Number of n X n 0..4 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.
%C A229772 Column 4 of A229774
%e A229772 Some solutions for n=3
%e A229772 ..3..3..1....1..1..0....3..2..0....0..0..0....3..1..1....2..1..1....2..1..1
%e A229772 ..3..3..4....4..2..3....4..3..2....3..2..1....4..4..2....4..1..1....4..3..1
%e A229772 ..4..3..0....4..3..2....4..4..0....3..4..3....4..4..4....4..3..3....4..4..4
%K A229772 nonn
%O A229772 1,1
%A A229772 _R. H. Hardin_, Sep 29 2013

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