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A299182
Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
2
4, 13, 20, 27, 47, 83, 137, 235, 412, 709, 1228, 2150, 3758, 6578, 11556, 20330, 35805, 63163, 111574, 197307, 349294, 618999, 1098034, 1949511, 3464203, 6160917, 10965304, 19530386, 34810655, 62087577, 110808092, 197881858, 353585148
OFFSET
1,1
COMMENTS
Column 3 of A299187.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) +3*a(n-3) -14*a(n-4) +a(n-5) +4*a(n-6) +23*a(n-7) +3*a(n-8) -10*a(n-9) -21*a(n-10) -4*a(n-11) +3*a(n-13) +a(n-14) +6*a(n-15) +6*a(n-16) +4*a(n-17) for n>19
EXAMPLE
Some solutions for n=5
..0..1..0. .0..1..1. .0..1..0. .0..1..1. .0..0..0. .0..0..0. .0..1..0
..0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..1..0. .0..1..0. .1..0..0
..1..1..1. .0..1..1. .0..0..0. .1..1..0. .0..0..0. .0..0..0. .0..0..0
..1..0..1. .0..1..1. .0..1..0. .0..0..0. .1..1..1. .1..1..1. .0..0..1
..1..1..1. .0..1..0. .0..0..0. .0..1..1. .1..0..1. .0..0..0. .0..1..0
CROSSREFS
Cf. A299187.
Sequence in context: A297884 A298289 A298489 * A030744 A173512 A295159
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2018
STATUS
approved