A284335 Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 4, 13, 34, 118, 419, 1481, 5394, 19848, 73880, 277222, 1047495, 3977615, 15169751, 58074521, 223081286, 859450114, 3319751314, 12852496680, 49860496892, 193783946748, 754379484650, 2941051327294, 11481400024511, 44875877924939

Offset

1,1

Comments

Row 2 of A284334.

Links

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

Example

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

Crossrefs

Cf. A284334.

Sequence in context: A148232 A148233 A148234 * A192443 A189590 A189597

Adjacent sequences: A284332 A284333 A284334 * A284336 A284337 A284338

Keyword

nonn

Author

R. H. Hardin, Mar 25 2017

Status

approved