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A282834
Number of nX4 0..1 arrays with no 1 equal to more than one of its king-move neighbors, with the exception of exactly two elements.
1
1, 16, 201, 2376, 17965, 151084, 1172252, 8673640, 63747749, 455684388, 3212866816, 22368251306, 153926106830, 1049611672826, 7098147763461, 47657875724972, 317957754308705, 2109287198397900, 13921714911191471
OFFSET
1,2
COMMENTS
Column 4 of A282838.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +36*a(n-2) -49*a(n-3) -1068*a(n-4) -2442*a(n-5) +5188*a(n-6) +46137*a(n-7) +122151*a(n-8) +166572*a(n-9) +43218*a(n-10) -252576*a(n-11) -585854*a(n-12) -567741*a(n-13) -163194*a(n-14) +501202*a(n-15) +813225*a(n-16) +687639*a(n-17) +136470*a(n-18) -261336*a(n-19) -411516*a(n-20) -243659*a(n-21) -86208*a(n-22) +19152*a(n-23) +14146*a(n-24) +5964*a(n-25) -3381*a(n-26) +343*a(n-27)
EXAMPLE
Some solutions for n=4
..1..0..1..1. .1..1..0..1. .0..0..0..1. .0..1..0..0. .1..1..1..0
..0..0..0..0. .0..0..1..0. .0..0..1..0. .0..1..0..0. .0..0..0..1
..1..0..0..0. .0..0..0..1. .0..1..0..1. .0..0..1..1. .0..0..0..0
..0..1..1..1. .1..0..0..0. .1..0..0..0. .1..0..0..0. .1..0..1..0
CROSSREFS
Cf. A282838.
Sequence in context: A129333 A001810 A016165 * A144632 A221825 A238282
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2017
STATUS
approved