A284216 Number of n X 2 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 6, 19, 62, 212, 751, 2719, 10002, 37258, 140108, 530646, 2021127, 7733421, 29702087, 114438213, 442099674, 1711885120, 6642102554, 25817134600, 100506778916, 391827603432, 1529486575678, 5977159139018, 23382840951503

Offset

1,1

Comments

Column 2 of A284222.

Links

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

Example

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

Crossrefs

Cf. A284222.

Sequence in context: A026012 A191993 A120900 * A059712 A059713 A109262

Adjacent sequences: A284213 A284214 A284215 * A284217 A284218 A284219

Keyword

nonn

Author

R. H. Hardin, Mar 23 2017

Status

approved