A238250 Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

121, 804, 6828, 43456, 284992, 1473792, 7616082, 32986844, 142361644, 537301496, 2020791427, 6843417893, 23099713493, 71683038307, 221767602558, 640525984280, 1844757869502, 5018918602972, 13619020527533, 35234899933725

Offset: 1

Author

R. H. Hardin, Feb 21 2014

Keywords

• nonn

Comments

Column 3 of A238255

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 81

Formula

Empirical recurrence of order 81 (see link above)