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A250540 Number of (n+1)X(4+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction 1
36552, 491650, 4169584, 27240292, 151170400, 752602024, 3475227442, 15210145612, 64036997144, 262068107390, 1050500245716, 4148232147580, 16207817815736, 62874459765364, 242824935032646, 935658630855012 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A250544
LINKS
FORMULA
Empirical: a(n) = 30*a(n-1) -415*a(n-2) +3514*a(n-3) -20386*a(n-4) +85924*a(n-5) -272198*a(n-6) +661180*a(n-7) -1244717*a(n-8) +1822478*a(n-9) -2068955*a(n-10) +1802474*a(n-11) -1181760*a(n-12) +563888*a(n-13) -184752*a(n-14) +37152*a(n-15) -3456*a(n-16)
EXAMPLE
Some solutions for n=1
..2..3..0..1..1....0..2..0..0..0....3..1..2..0..2....3..1..2..2..0
..1..2..0..3..3....0..2..0..3..3....0..0..2..0..3....0..1..2..2..2
CROSSREFS
Sequence in context: A204967 A011771 A011770 * A251797 A143369 A203939
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 24 2014
STATUS
approved

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Last modified May 23 22:02 EDT 2024. Contains 372765 sequences. (Running on oeis4.)