A184603 1/4 the number of (n+1) X 9 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.

10704, 3333345, 1339793447, 586441134417, 266823559411796, 124201308194651058, 58705095126108291860, 28056029360014523631654, 13521010840482176059922831, 6558986191129563851102130327

Offset

1,1

Comments

Column 8 of A184604.

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for 3 X 9:
..0..0..1..1..1..0..0..1..1....0..0..0..0..1..1..0..0..0
..0..0..0..0..1..0..0..0..1....0..0..0..1..1..1..1..1..0
..0..0..0..1..0..1..1..1..1....0..0..0..0..1..1..1..1..0

Crossrefs

Sequence in context: A207478 A207534 A238067 * A247854 A117090 A255038

Adjacent sequences: A184600 A184601 A184602 * A184604 A184605 A184606

Keyword

nonn

Author

R. H. Hardin, Jan 18 2011

Status

approved