A186627 Number of (n+2)X4 0..3 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

9576448, 876951552, 80485522400, 7188107084815, 422905697694540, 24906342705832823, 1460201980801808620, 63739557332176142137, 2783635995639584526500, 121426165183353517129064

Offset

1,1

Comments

Column 2 of A186629

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for 6X4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..0..0..3....1..2..1..1....1..1..1..2....0..3..2..2....0..0..2..0
..0..0..0..3....0..0..0..3....0..0..0..1....1..0..0..1....0..0..0..3
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..0..3..1....1..1..3..1....1..3..3..1....0..2..3..3....2..0..2..1

Crossrefs

Sequence in context: A184570 A124515 A075009 * A203660 A250518 A268252

Adjacent sequences: A186624 A186625 A186626 * A186628 A186629 A186630

Keyword

nonn

Author

R. H. Hardin, Feb 24 2011

Status

approved