A227677 Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order

11, 131, 1343, 11971, 90884, 592791, 3380440, 17161921, 78807477, 331649881, 1292860261, 4709556398, 16147197916, 52422604429, 161978060979, 478412562214, 1355794408584, 3698766477709, 9741946309658, 24835300279682, 61420677587519

Offset

1,1

Comments

Column 4 of A227679

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 30

Formula

Empirical polynomial of degree 30 (see link above)

Example

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

Crossrefs

Sequence in context: A083763 A185127 A287295 * A302759 A076255 A076357

Adjacent sequences: A227674 A227675 A227676 * A227678 A227679 A227680

Keyword

nonn

Author

R. H. Hardin Jul 19 2013

Status

approved