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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.

A229770 Number of n X n 0..2 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.

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%I A229770 #7 Jul 23 2025 05:46:25
%S A229770 3,22,322,12958,2179956,1976588468,10811999412826,378274896023686216,
%T A229770 88035611475274172311886,140618374201747733896872001960
%N A229770 Number of n X n 0..2 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.
%C A229770 Column 2 of A229774
%e A229770 Some solutions for n=3
%e A229770 ..1..1..1....1..1..0....1..1..1....1..1..0....2..2..1....1..0..0....1..0..0
%e A229770 ..1..1..1....2..1..1....2..1..0....2..0..0....2..2..1....1..0..0....1..2..1
%e A229770 ..2..2..0....2..1..2....2..1..1....2..1..2....2..2..1....2..1..0....2..1..1
%K A229770 nonn
%O A229770 1,1
%A A229770 _R. H. Hardin_, Sep 29 2013

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