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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
OFFSET
1,1
COMMENTS
Column 4 of A284165.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 21 2017
STATUS
approved