A227674 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order

2, 16, 283, 11971, 1330361, 418147052, 392636087774, 1142471406383630

Offset

1,1

Comments

Diagonal of A227679

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..0..0..1..0....0..1..0..0....0..1..0..0....1..0..0..0....0..0..0..1
..1..0..1..1....1..0..0..0....0..0..0..1....0..0..1..1....0..0..1..0
..0..0..1..0....0..1..1..1....1..0..0..0....0..1..0..1....0..1..1..0
..1..0..0..1....0..1..1..1....0..1..0..0....1..1..1..1....1..0..0..1

Crossrefs

Sequence in context: A000182 A009764 A189257 * A102599 A123744 A136796

Adjacent sequences: A227671 A227672 A227673 * A227675 A227676 A227677

Keyword

nonn

Author

R. H. Hardin Jul 19 2013

Status

approved