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 A251801 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having x11-x00 less than x10-x01 13
 150, 1080, 1740, 6627, 28932, 19269, 36552, 348679, 724300, 216912, 187000, 3352272, 17195593, 18577404, 2430631, 905440, 27291608, 294088336, 873945739, 474547100, 27278035, 4206453, 195753488, 3934266515, 26787273856, 44356434596 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .......150.........1080............6627.............36552..............187000 ......1740........28932..........348679...........3352272............27291608 .....19269.......724300........17195593.........294088336..........3934266515 ....216912.....18577404.......873945739.......26787273856........594938582014 ...2430631....474547100.....44356434596.....2446811684440......90717637876583 ..27278035..12140516092...2255553135793...224175608341756...13902663302194715 .305991368.310512400748.114701510008550.20552060379396424.2134102396738819286 LINKS R. H. Hardin, Table of n, a(n) for n = 1..112 FORMULA Empirical for column k: k=1: [linear recurrence of order 7] k=2: [order 20] Empirical for row n: n=1: [linear recurrence of order 7] n=2: [order 22] n=3: [order 40] n=4: [order 52] EXAMPLE Some solutions for n=2 k=4 ..0..2..0..0..2....0..2..2..3..1....0..0..0..3..3....0..0..2..1..1 ..0..0..2..2..3....0..0..0..1..3....0..0..2..1..3....0..2..0..2..3 ..2..2..1..3..3....0..1..3..2..2....0..0..1..3..3....2..0..3..3..3 CROSSREFS Column 1 is A184665 Row 1 is A223069(n+1) Sequence in context: A140671 A054558 A250544 * A211554 A073614 A191547 Adjacent sequences: A251798 A251799 A251800 * A251802 A251803 A251804 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 09 2014 STATUS approved

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Last modified March 4 07:25 EST 2024. Contains 370522 sequences. (Running on oeis4.)