A284161 Number of n X 4 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

6, 42, 461, 5888, 80072, 1142173, 16699997, 247899694, 3717494360, 56178550056, 854108948176, 13048507894281, 200142020916533, 3080098116131143, 47536024103910119, 735432363055523510, 11402172535387288712

Offset

1,1

Comments

Column 4 of A284165.

Links

R. H. Hardin, Table of n, a(n) for n = 1..173

Example

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

Crossrefs

Cf. A284165.

Sequence in context: A306173 A254529 A098461 * A034662 A074651 A330345

Adjacent sequences: A284158 A284159 A284160 * A284162 A284163 A284164

Keyword

nonn

Author

R. H. Hardin, Mar 21 2017

Status

approved