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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.

A223969 Number of n X n 0..2 arrays with rows and antidiagonals unimodal.

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%I A223969 #7 Jul 23 2025 04:43:33
%S A223969 3,81,9515,2558848,1140963027,715985189481,574360426081996,
%T A223969 553932588795530549,616038706732274614176,766990732794703992309550,
%U A223969 1046181711135056928867576316,1538264672813438079567996935803
%N A223969 Number of n X n 0..2 arrays with rows and antidiagonals unimodal.
%C A223969 Diagonal of A223975
%e A223969 Some solutions for n=3
%e A223969 ..0..1..1....1..2..1....0..1..0....0..1..1....2..2..0....1..2..0....0..2..0
%e A223969 ..1..1..2....0..2..2....0..1..2....1..2..0....0..1..0....0..1..0....1..1..0
%e A223969 ..2..0..0....0..2..1....2..2..1....2..2..2....0..0..0....0..1..0....2..0..0
%K A223969 nonn
%O A223969 1,1
%A A223969 _R. H. Hardin_ Mar 30 2013

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