A204101 Number of (n+1)X(n+1) 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that b(i,j)*b(i-1,j)-c(i,j)*c(i,j-1) is nonzero

36, 864, 46656, 5738688, 1631513664, 1084257353088, 1688734588654656, 6186063092597707968, 53367767165496952526400, 1085885663438501136777646080, 52151788282239671615810458238016

Offset

1,1

Comments

Also 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements

Diagonal of A204106

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=5
..2..1..2..1..1..1....0..0..0..0..0..0....2..2..1..2..2..1....2..1..0..2..1..2
..2..0..2..0..2..2....1..2..2..2..1..1....0..0..1..0..0..0....2..1..0..2..0..0
..2..1..2..1..1..0....0..0..0..0..0..2....1..2..2..2..1..2....2..1..0..1..1..2
..2..1..2..0..2..2....1..1..2..1..1..1....1..0..1..0..0..2....0..1..2..2..0..0
..2..1..2..0..1..0....2..0..0..0..2..2....2..2..1..2..1..2....2..1..0..1..1..1
..0..1..2..0..2..2....1..1..1..1..1..0....0..0..0..0..0..2....0..1..2..2..2..0

Crossrefs

Sequence in context: A264192 A122038 A222926 * A283199 A346323 A243569

Adjacent sequences: A204098 A204099 A204100 * A204102 A204103 A204104

Keyword

nonn

Author

R. H. Hardin Jan 10 2012

Status

approved