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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.
1
10704, 3333345, 1339793447, 586441134417, 266823559411796, 124201308194651058, 58705095126108291860, 28056029360014523631654, 13521010840482176059922831, 6558986191129563851102130327
OFFSET
1,1
COMMENTS
Column 8 of A184604.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2011
STATUS
approved