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A250568 Number of (n+2)X(2+2) 0..1 arrays with nondecreasing maximum of every three consecutive values in every row and column 1
3375, 39852, 463006, 5281190, 59025322, 656805747, 7283102949, 80572967431, 890627215921, 9839229259206, 108665126977996, 1199931916374100, 13249074252546292, 146283120433185333, 1615074451183837275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250574

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 14*a(n-1) -10*a(n-2) -30*a(n-3) -3170*a(n-4) +4216*a(n-5) +25146*a(n-6) +250042*a(n-7) -341325*a(n-8) -1568242*a(n-9) -8687308*a(n-10) +9449792*a(n-11) +35649848*a(n-12) +155138752*a(n-13) -115721952*a(n-14) -382633312*a(n-15) -1555690146*a(n-16) +675955548*a(n-17) +2149108188*a(n-18) +9193269172*a(n-19) -1764843612*a(n-20) -6156832816*a(n-21) -32786507324*a(n-22) +802730756*a(n-23) +7136229438*a(n-24) +71641688940*a(n-25) +4949326424*a(n-26) +2825573648*a(n-27) -98127631080*a(n-28) -10872718912*a(n-29) -16123327568*a(n-30) +85681472432*a(n-31) +10646497059*a(n-32) +17459854358*a(n-33) -48074175586*a(n-34) -5906103334*a(n-35) -9299023250*a(n-36) +17317546552*a(n-37) +1919830834*a(n-38) +2745659890*a(n-39) -3906740593*a(n-40) -357055738*a(n-41) -455410940*a(n-42) +517200448*a(n-43) +32835072*a(n-44) +37028096*a(n-45) -36292608*a(n-46) -1146880*a(n-47) -917504*a(n-48) +1048576*a(n-49)

EXAMPLE

Some solutions for n=2

..0..1..0..0....0..0..0..0....0..0..0..0....0..1..0..1....0..0..1..0

..0..1..0..0....1..0..1..0....1..1..1..1....1..1..1..1....0..1..0..1

..0..0..1..0....1..0..1..0....1..0..1..0....0..1..1..0....1..1..1..1

..1..0..0..1....1..0..1..1....1..1..1..0....1..1..0..1....0..1..1..0

CROSSREFS

Sequence in context: A164521 A251153 A305500 * A183823 A114769 A013803

Adjacent sequences:  A250565 A250566 A250567 * A250569 A250570 A250571

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 25 2014

STATUS

approved

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Last modified September 27 07:56 EDT 2022. Contains 357052 sequences. (Running on oeis4.)