A284765 Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.

0, 4, 14, 52, 206, 772, 2896, 10996, 41862, 159836, 612572, 2354880, 9076852, 35073264, 135823868, 527012084, 2048410070, 7974173484, 31085538148, 121332433984, 474123211448, 1854631573500, 7261693567782, 28457603057044

Offset

1,2

Comments

Column 2 of A284771.

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. .1..0. .1..0. .1..0. .1..1. .0..1
..0..0. .0..0. .0..0. .1..0. .1..0. .1..0. .0..1. .0..1. .0..0. .0..0
..0..0. .0..1. .1..0. .0..0. .1..0. .0..0. .0..0. .1..0. .0..0. .0..1
..1..1. .1..0. .1..1. .1..1. .0..0. .1..0. .0..1. .0..0. .0..1. .1..0

Crossrefs

Cf. A284771.

Sequence in context: A262594 A345242 A370891 * A129997 A308023 A149489

Adjacent sequences: A284762 A284763 A284764 * A284766 A284767 A284768

Keyword

nonn

Author

R. H. Hardin, Apr 02 2017

Status

approved