A293081 Number of n X 2 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 0, 1, 10, 60, 304, 1420, 6312, 27167, 114412, 474563, 1947098, 7925708, 32072580, 129213082, 518818124, 2077775396, 8304424080, 33138971978, 132078954532, 525904271587, 2092410377864, 8320012474033, 33066905278394, 131371155380369

Offset

1,4

Comments

Column 2 of A293087.

Links

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

Example

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

Crossrefs

Cf. A293087.

Sequence in context: A004406 A003472 A112502 * A292489 A083585 A250575

Adjacent sequences: A293078 A293079 A293080 * A293082 A293083 A293084

Keyword

nonn

Author

R. H. Hardin, Sep 30 2017

Status

approved