A285146 Number of n X 2 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 one less than the number of 0's adjacent to some 1.

0, 2, 12, 56, 236, 950, 3752, 14684, 57192, 222308, 863808, 3357766, 13061980, 50859826, 198235896, 773453896, 3020781528, 11809145656, 46207264696, 180955506800, 709219185000, 2781727573396, 10918267462160, 42882371536718

Offset

1,2

Comments

Column 2 of A285152.

Links

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

Example

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

Crossrefs

Cf. A285152.

Sequence in context: A304194 A124723 A122229 * A127216 A006659 A194771

Adjacent sequences: A285143 A285144 A285145 * A285147 A285148 A285149

Keyword

nonn

Author

R. H. Hardin, Apr 12 2017

Status

approved