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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.

A224006 Number of n X n 0..2 arrays with rows nondecreasing and antidiagonals unimodal.

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%I A224006 #7 Jul 23 2025 04:50:17
%S A224006 3,36,868,28541,1108969,47735665,2200064042,106468976628,
%T A224006 5346274348879,276427362685199,14638913051219770,790954334539356094,
%U A224006 43473056647367595435,2424900281957535784114,137007153893707984264455
%N A224006 Number of n X n 0..2 arrays with rows nondecreasing and antidiagonals unimodal.
%C A224006 Diagonal of A224012
%e A224006 Some solutions for n=3
%e A224006 ..1..2..2....1..1..1....0..0..2....1..1..2....0..0..2....2..2..2....1..1..1
%e A224006 ..1..1..1....1..1..2....0..1..2....0..0..2....0..0..1....1..1..2....0..0..0
%e A224006 ..0..1..2....0..0..0....1..2..2....0..0..0....0..2..2....1..2..2....0..2..2
%K A224006 nonn
%O A224006 1,1
%A A224006 _R. H. Hardin_ Mar 30 2013

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