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 A203371 T(n,k)=Number of nXk 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0 8
 1, 2, 2, 3, 9, 3, 5, 30, 30, 5, 8, 110, 206, 110, 8, 13, 390, 1570, 1570, 390, 13, 21, 1399, 11541, 25087, 11541, 1399, 21, 34, 4998, 85932, 386353, 386353, 85932, 4998, 34, 55, 17881, 636912, 6026844, 12450511, 6026844, 636912, 17881, 55, 89, 63940, 4728287 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Table starts ..1.....2.......3..........5............8..............13................21 ..2.....9......30........110..........390............1399..............4998 ..3....30.....206.......1570........11541...........85932............636912 ..5...110....1570......25087.......386353.........6026844..........93584344 ..8...390...11541.....386353.....12450511.......406389748.......13204707603 .13..1399...85932....6026844....406389748.....27758308569.....1887519232797 .21..4998..636912...93584344..13204707603...1887519232797...268596415269518 .34.17881.4728287.1455532600.429752891417.128552812110552.38282460992672716 LINKS R. H. Hardin, Table of n, a(n) for n = 1..442 EXAMPLE Some solutions for n=4 k=3 ..0..1..0....0..0..1....0..0..1....0..0..1....0..0..1....0..1..0....0..0..0 ..1..0..0....0..0..2....0..0..2....0..0..2....0..0..0....1..0..1....0..0..0 ..0..1..0....0..0..0....1..0..0....0..0..0....0..0..0....0..0..1....0..0..0 ..0..0..1....0..0..0....0..0..1....0..0..1....0..0..0....1..1..0....1..2..0 CROSSREFS Column 1 is A000045(n+1) Sequence in context: A252848 A241475 A132812 * A181206 A274959 A143307 Adjacent sequences:  A203368 A203369 A203370 * A203372 A203373 A203374 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 31 2011 STATUS approved

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)