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A275347 Number of nX3 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-2) and new values introduced in order 0..2. 1
5, 81, 288, 1024, 4100, 16956, 70272, 291320, 1211092, 5070832, 21255328, 89170864, 374453028, 1574982464, 6627474512, 27898519192, 117476409700, 494869331248, 2084962994672, 8785404327328, 37022705828932, 156033713723616 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A275352.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +12*a(n-2) -48*a(n-3) +66*a(n-4) -210*a(n-5) -1120*a(n-6) +4028*a(n-7) -93*a(n-8) -4098*a(n-9) +27840*a(n-10) -78748*a(n-11) -37816*a(n-12) +204592*a(n-13) -97088*a(n-14) -576*a(n-15) +25984*a(n-16) -12544*a(n-17) for n>20
EXAMPLE
Some solutions for n=4
..0..1..2. .0..0..0. .0..1..1. .0..1..0. .0..1..0. .0..1..2. .0..1..0
..1..1..1. .1..0..2. .1..2..2. .0..2..1. .1..0..1. .2..0..1. .1..2..1
..0..1..2. .1..2..2. .2..2..2. .2..1..2. .2..2..2. .0..1..0. .2..1..2
..0..2..2. .2..0..2. .1..0..0. .1..2..1. .1..0..1. .1..0..2. .0..0..1
CROSSREFS
Cf. A275352.
Sequence in context: A277302 A189443 A275091 * A110257 A335177 A135918
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 24 2016
STATUS
approved

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Last modified February 21 06:16 EST 2024. Contains 370219 sequences. (Running on oeis4.)