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A269049
Number of nX5 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.
1
144, 1068, 13140, 149358, 1643376, 17696520, 187575858, 1964080920, 20365312416, 209472681102, 2140087086852, 21738862087680, 219728193571542, 2211332610944712, 22170082238167692, 221519854346189046
OFFSET
1,1
COMMENTS
Column 5 of A269052.
LINKS
FORMULA
Empirical: a(n) = 28*a(n-1) -286*a(n-2) +1290*a(n-3) -2373*a(n-4) +304*a(n-5) +3551*a(n-6) -2846*a(n-7) -546*a(n-8) +1308*a(n-9) -505*a(n-10) +76*a(n-11) -4*a(n-12) for n>13
EXAMPLE
Some solutions for n=4
..0..1..2..2..0. .2..1..2..1..2. .0..1..2..1..2. .1..2..1..0..0
..0..1..2..1..2. .2..1..2..1..2. .0..0..0..1..0. .2..2..1..0..1
..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .1..0..1..0..1
..0..1..0..1..0. .2..0..0..0..0. .0..0..0..1..2. .1..0..1..2..1
CROSSREFS
Cf. A269052.
Sequence in context: A165080 A165082 A165088 * A165086 A337794 A235568
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 18 2016
STATUS
approved