A184602 1/4 the number of (n+1) X 8 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.

2880, 446426, 89538170, 19597196907, 4461217004146, 1038876920232926, 245608218357699105, 58705095126108291860, 14148602810460027001369, 3432240397744170829576350, 836984055384644047944565034

Offset

1,1

Comments

Column 7 of A184604.

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

Some solutions for 3 X 8:
..0..0..1..1..1..1..0..1....0..0..1..1..0..0..1..0....0..0..0..1..1..0..1..0
..1..0..0..1..0..1..0..1....1..0..0..1..0..1..0..1....0..0..0..0..0..1..1..1
..0..0..0..1..0..0..1..1....1..0..1..1..1..0..1..1....1..1..1..0..0..1..1..1

Crossrefs

Sequence in context: A260369 A134856 A066407 * A144547 A259403 A241529

Adjacent sequences: A184599 A184600 A184601 * A184603 A184604 A184605

Keyword

nonn

Author

R. H. Hardin, Jan 18 2011

Status

approved