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 A199101 T(n,k)=Number of nXk 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors 9
 1, 1, 1, 1, 6, 1, 6, 15, 15, 6, 15, 280, 280, 280, 15, 15, 2040, 5295, 5295, 2040, 15, 105, 5503, 101460, 732964, 101460, 5503, 105, 280, 113010, 1999365, 38753124, 38753124, 1999365, 113010, 280, 280, 857532, 40210161, 743464228, 5569129037, 743464228 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts ....1........1............1...............6................15................15 ....1........6...........15.............280..............2040..............5503 ....1.......15..........280............5295............101460...........1999365 ....6......280.........5295..........732964..........38753124.........743464228 ...15.....2040.......101460........38753124........5569129037......287771242262 ...15.....5503......1999365.......743464228......287771242262...114472439855502 ..105...113010.....40210161....115707966228...123022787797053.46438726281827509 ..280...857532....820951127...6468027944244.18696906414385635 ..280..2340127..16962540224.127149344295419 .2100.50784920.353916457700 LINKS R. H. Hardin, Table of n, a(n) for n = 1..83 EXAMPLE Some solutions for n=5 k=3 ..0..1..2....0..1..0....0..1..0....0..1..0....0..1..1....0..0..1....0..0..1 ..1..0..0....2..0..1....0..2..2....2..1..0....2..1..0....0..0..2....2..1..0 ..2..1..2....2..2..2....1..2..0....2..2..1....2..0..0....2..1..1....1..2..2 ..2..0..2....1..1..2....1..0..1....0..1..2....1..2..2....1..1..0....2..0..1 ..1..1..0....1..0..0....2..2..1....1..0..2....2..0..1....2..2..2....1..2..0 CROSSREFS Sequence in context: A159828 A131114 A199230 * A127778 A076714 A299620 Adjacent sequences:  A199098 A199099 A199100 * A199102 A199103 A199104 KEYWORD nonn,tabl AUTHOR R. H. Hardin Nov 02 2011 STATUS approved

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Last modified July 1 22:23 EDT 2022. Contains 354984 sequences. (Running on oeis4.)