cp's OEIS Frontend

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.

A223736 Number of n X n 0..2 arrays with rows, columns, diagonals and antidiagonals unimodal.

This page as a plain text file.
%I A223736 #7 Jul 23 2025 04:26:12
%S A223736 3,81,5600,480236,41586328,3437215802,268717054875,19964011820443
%N A223736 Number of n X n 0..2 arrays with rows, columns, diagonals and antidiagonals unimodal.
%C A223736 Diagonal of A223742
%e A223736 Some solutions for n=3
%e A223736 ..0..1..0....0..0..0....2..0..0....1..1..1....0..2..0....2..2..2....1..2..0
%e A223736 ..0..0..0....1..2..2....2..1..0....1..1..2....0..2..2....2..2..1....2..2..2
%e A223736 ..0..0..0....2..2..2....2..2..1....0..1..0....0..0..1....1..2..1....1..1..2
%K A223736 nonn
%O A223736 1,1
%A A223736 _R. H. Hardin_ Mar 26 2013

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.