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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. 1
6, 42, 461, 5888, 80072, 1142173, 16699997, 247899694, 3717494360, 56178550056, 854108948176, 13048507894281, 200142020916533, 3080098116131143, 47536024103910119, 735432363055523510, 11402172535387288712 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 24 20:26 EDT 2021. Contains 346273 sequences. (Running on oeis4.)