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A268748
Number of nX6 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.
1
41, 659, 10830, 165019, 2425799, 34732937, 487682438, 6746117783, 92215499119, 1248437108837, 16766958502992, 223674635599161, 2966748789292217, 39154974765661223, 514529476985579624, 6735601878829825279
OFFSET
1,1
COMMENTS
Column 6 of A268750.
LINKS
FORMULA
Empirical: a(n) = 16*a(n-1) +60*a(n-2) -1148*a(n-3) -3346*a(n-4) +16272*a(n-5) +36588*a(n-6) -104246*a(n-7) -147989*a(n-8) +349140*a(n-9) +217324*a(n-10) -591448*a(n-11) -19320*a(n-12) +431032*a(n-13) -151921*a(n-14) -73194*a(n-15) +41684*a(n-16) +2552*a(n-17) -3594*a(n-18) +148*a(n-19) +100*a(n-20) -4*a(n-21) -a(n-22)
EXAMPLE
Some solutions for n=4
..0..0..1..1..0..0. .1..0..1..0..1..0. .0..0..0..1..0..1. .0..1..0..0..0..1
..0..1..0..0..0..1. .0..0..0..1..0..0. .0..0..0..1..0..0. .0..0..1..0..1..0
..0..0..1..0..1..0. .0..1..0..0..0..0. .1..0..0..0..0..0. .0..0..0..1..0..0
..0..1..0..1..0..0. .0..1..0..0..0..1. .0..0..1..0..1..0. .1..0..1..0..0..1
CROSSREFS
Cf. A268750.
Sequence in context: A078947 A299600 A197371 * A143010 A009730 A009761
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2016
STATUS
approved