A227164 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

6, 66, 558, 4528, 37012, 283430, 2010569, 13174529, 79606861, 445291143, 2319506105, 11318251449, 52022806997, 226357815317, 936451009248, 3697654793472, 13982230433991, 50782778554993, 177615062917012

Offset: 1

Author

R. H. Hardin Jul 03 2013

Keywords

• nonn

Comments

Column 5 of A227165

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 39

Formula

Empirical polynomial of degree 39 (see link above)