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 A198528 T(n,k)=Number of nXk 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 8
 1, 2, 2, 5, 15, 5, 15, 193, 193, 15, 52, 3660, 16714, 3660, 52, 202, 81844, 1877316, 1877316, 81844, 202, 855, 1948672, 222590953, 1084539825, 222590953, 1948672, 855, 3845, 47436498, 26670041125, 634586561196, 634586561196, 26670041125 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Table starts .....1............2...................5......................15 .....2...........15.................193....................3660 .....5..........193...............16714.................1877316 ....15.........3660.............1877316..............1084539825 ....52........81844...........222590953............634586561196 ...202......1948672.........26670041125.........371815743708461 ...855.....47436498.......3201911378187......217885196778717007 ..3845...1163606279.....384557171168810...127683385189755792564 .18002..28617909415...46189600128813487.74824145653256981522691 .86472.704465305625.5547962760669962158 LINKS R. H. Hardin, Table of n, a(n) for n = 1..84 EXAMPLE Some solutions for n=6 k=4 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0 ..0..1..1..0....0..1..1..0....0..1..1..0....0..1..1..0....0..1..1..0 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0 ..2..2..1..2....2..2..1..2....2..2..1..2....2..2..1..2....2..2..1..2 ..2..2..3..2....0..3..1..2....3..0..0..3....2..0..1..0....0..3..4..4 ..1..4..0..4....3..2..4..4....3..1..4..3....1..3..0..0....3..3..0..4 CROSSREFS Column 1 is A056272 Sequence in context: A200801 A241119 A208408 * A208466 A098888 A089848 Adjacent sequences: A198525 A198526 A198527 * A198529 A198530 A198531 KEYWORD nonn,tabl AUTHOR R. H. Hardin Oct 26 2011 STATUS approved

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Last modified September 9 15:13 EDT 2024. Contains 375765 sequences. (Running on oeis4.)