A284337 Number of 4 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.

8, 42, 415, 5130, 68458, 966889, 13941789, 204883324, 3047634270, 45762072338, 692220227870, 10532157295267, 161005503857341, 2470999756894057, 38049394554096755, 587563040419449964, 9095438545580032870

Offset

1,1

Comments

Row 4 of A284334.

Links

R. H. Hardin, Table of n, a(n) for n = 1..128

Example

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

Crossrefs

Cf. A284334.

Sequence in context: A238723 A316283 A236328 * A052666 A065789 A025064

Adjacent sequences: A284334 A284335 A284336 * A284338 A284339 A284340

Keyword

nonn

Author

R. H. Hardin, Mar 25 2017

Status

approved