A238251 Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

286, 2818, 43456, 523578, 6683137, 65450601, 640472606, 5080416791, 40066932588, 267891545518, 1781590953402, 10371478598345, 60084341166190, 311815187891138, 1610762741432521, 7583058204030841, 35540971632237331

Offset: 1

Author

R. H. Hardin, Feb 21 2014

Keywords

• nonn

Comments

Column 4 of A238255

Examples

			Some solutions for n=3
..0..0..0..0..1....0..1..1..1..1....0..0..0..0..1....0..0..0..1..1
..0..0..1..0..1....0..1..0..1..0....0..1..1..1..1....0..1..1..1..1
..0..1..0..1..0....1..1..0..1..1....0..0..1..0..0....1..1..1..1..1
..1..1..1..1..1....1..0..1..1..1....1..1..0..1..1....1..1..1..0..0
		

Links

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