A285024 Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.

0, 2, 6, 26, 104, 402, 1578, 6196, 24310, 95446, 374872, 1472938, 5790024, 22768624, 89562540, 352395768, 1386874908, 5459330780, 21494802570, 84648191106, 333419873528, 1313575442496, 5176174458602, 20401118165166, 80425006887898

Offset

1,2

Comments

Column 2 of A285030.

Links

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

Example

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

Crossrefs

Cf. A285030.

Sequence in context: A191821 A290958 A323265 * A192403 A282618 A192435

Adjacent sequences: A285021 A285022 A285023 * A285025 A285026 A285027

Keyword

nonn

Author

R. H. Hardin, Apr 08 2017

Status

approved