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

Author

R. H. Hardin Jul 09 2013

Keywords

• nonn

Comments

Column 5 of A227385

Examples

			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
		

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)