A227331 Number of n X 4 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 5 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order.

15, 104, 708, 4917, 33297, 204206, 1108382, 5361624, 23477312, 94474684, 353596604, 1242207201, 4125406694, 13026205724, 39292608858, 113681479364, 316556625809, 850933663116, 2213918991347, 5587988935294, 13711077238915

Offset

1,1

Comments

Column 4 of A227333.

Links

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

R. H. Hardin, Empirical polynomial of degree 31

Formula

Empirical polynomial of degree 31 (see link above).

Example

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

Crossrefs

Sequence in context: A205424 A219624 A219170 * A223441 A300295 A102791

Adjacent sequences: A227328 A227329 A227330 * A227332 A227333 A227334

Keyword

nonn

Author

R. H. Hardin Jul 07 2013

Status

approved