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A303079
Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
1, 12, 32, 112, 416, 1512, 5472, 19904, 72396, 263136, 956480, 3477232, 12641136, 45954928, 167063792, 607344064, 2207938656, 8026742304, 29180448720, 106082737616, 385653691936, 1402007389776, 5096865080336, 18529170684512
OFFSET
1,2
COMMENTS
Column 3 of A303084.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -7*a(n-2) +14*a(n-3) -24*a(n-4) +4*a(n-5) -12*a(n-6) -8*a(n-7) +12*a(n-8) -24*a(n-9) -4*a(n-10) -8*a(n-11)
EXAMPLE
Some solutions for n=5
..0..0..1. .0..1..0. .0..1..0. .0..0..1. .0..0..0. .0..0..0. .0..0..0
..1..0..0. .1..1..1. .1..1..1. .0..0..1. .1..0..1. .1..0..1. .1..0..1
..0..0..0. .1..1..0. .0..1..0. .0..0..1. .0..0..1. .1..0..0. .0..0..1
..1..1..1. .1..1..0. .1..1..1. .1..0..0. .0..0..0. .0..0..0. .1..0..0
..1..1..1. .0..1..1. .1..1..0. .0..0..0. .0..0..1. .1..0..0. .0..0..1
CROSSREFS
Cf. A303084.
Sequence in context: A068381 A143238 A102091 * A268769 A045669 A045660
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 18 2018
STATUS
approved