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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 1 22:31 EST 2022. Contains 358485 sequences. (Running on oeis4.)