A227384 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order

6, 56, 587, 6160, 61127, 550010, 4450124, 32473856, 215116595, 1303420926, 7278846827, 37731073135, 182726436203, 831526393503, 3573916903775, 14573693121509, 56609147953260, 210199678971798, 748463901892529

Offset

1,1

Comments

Column 5 of A227385

Links

R. H. Hardin, Table of n, a(n) for n = 1..87

R. H. Hardin, Empirical polynomial of degree 39

Formula

Empirical polynomial of degree 39 (see link above)

Example

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

Crossrefs

Sequence in context: A099140 A371739 A048348 * A199755 A025749 A365766

Adjacent sequences: A227381 A227382 A227383 * A227385 A227386 A227387

Keyword

nonn

Author

R. H. Hardin Jul 09 2013

Status

approved