cp's OEIS Frontend

A223980 Number of 7Xn 0..2 arrays with rows and antidiagonals unimodal.

%I A223980 #8 Jul 23 2025 04:45:10
%S A223980 2187,4782969,1380511272,92756321858,2708281019793,47087051658638,
%T A223980 574360426081996,5392250304954708,41292036231202766,
%U A223980 268318893714852915,1522088317195862139,7698392543196415664,35283079262827759084
%N A223980 Number of 7Xn 0..2 arrays with rows and antidiagonals unimodal.
%C A223980 Row 7 of A223975
%H A223980 R. H. Hardin, <a href="/A223980/b223980.txt">Table of n, a(n) for n = 1..113</a>
%H A223980 R. H. Hardin, <a href="/A223980/a223980.txt">Empirical polynomial of degree 28</a>
%F A223980 Empirical polynomial of degree 28 (see link above)
%e A223980 Some solutions for n=3
%e A223980 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
%e A223980 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
%e A223980 ..0..0..1....0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0
%e A223980 ..0..1..0....0..1..1....0..1..0....0..0..1....0..0..0....1..0..0....0..1..0
%e A223980 ..0..2..2....2..2..0....1..2..1....1..1..1....2..1..0....0..0..0....2..0..0
%e A223980 ..0..2..2....1..1..0....2..2..0....2..1..1....1..1..2....1..2..1....0..0..0
%e A223980 ..1..1..0....0..1..2....0..1..2....1..1..2....2..1..1....2..2..1....0..0..0
%K A223980 nonn
%O A223980 1,1
%A A223980 _R. H. Hardin_ Mar 30 2013