A227262 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order.

6, 96, 1111, 11932, 112349, 937865, 6961606, 46364258, 280471755, 1557597103, 8014162577, 38505244717, 173924889597, 742804988619, 3014292672706, 11671178123287, 43274437542484, 154133395370348, 528811622382841

Offset: 1

Author

R. H. Hardin Jul 04 2013

Keywords

• nonn

Comments

Column 5 of A227263

Examples

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