A206654 Number of (n+2)X5 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order

1517, 8374, 50529, 305347, 1839784, 11172263, 67724531, 410177144, 2486962308, 15075219306, 91365402832, 553811854726, 3356885567485, 20346820069282, 123328702944406, 747537064469943, 4531048838872687, 27464108126394996

Offset

1,1

Comments

Column 3 of A206659

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..1..0..1..0....0..1..0..1..1....0..1..0..1..0....0..0..0..0..0
..0..1..0..0..1....1..0..1..1..1....0..0..0..0..0....1..1..0..1..0
..1..1..0..1..0....0..0..0..1..0....1..1..1..1..1....1..1..1..1..1
..1..1..0..0..0....0..0..1..1..0....0..0..1..0..1....1..0..0..0..0
..1..0..0..0..1....1..1..1..1..0....0..1..1..0..0....0..0..0..1..1
..1..0..0..1..1....0..0..0..1..1....0..1..1..0..1....1..1..0..1..1

Crossrefs

Sequence in context: A020415 A257753 A236724 * A356767 A112641 A203386

Adjacent sequences: A206651 A206652 A206653 * A206655 A206656 A206657

Keyword

nonn

Author

R. H. Hardin Feb 11 2012

Status

approved