A269009 Number of nX6 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

20, 272, 4948, 73568, 1049588, 14382480, 192100836, 2516546784, 32481770852, 414339126768, 5234937372516, 65617049910368, 816985376286500, 10114119489148976, 124593533629907540, 1528232910934667360

Offset

1,1

Comments

Column 6 of A269011.

Links

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

Formula

Empirical: a(n) = 28*a(n-1) -230*a(n-2) +192*a(n-3) +3805*a(n-4) -5776*a(n-5) -27808*a(n-6) +25744*a(n-7) +101333*a(n-8) -13916*a(n-9) -149690*a(n-10) -66848*a(n-11) +23183*a(n-12) +9888*a(n-13) -2304*a(n-14)

Example

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

Crossrefs

Cf. A269011.

Sequence in context: A019793 A021774 A181384 * A307038 A019613 A021514

Adjacent sequences: A269006 A269007 A269008 * A269010 A269011 A269012

Keyword

nonn

Author

R. H. Hardin, Feb 17 2016

Status

approved