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A250586 Number of (n+1)X(2+1) 0..2 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1
167, 825, 3641, 14983, 59160, 226985, 855988, 3188758, 11789698, 43358285, 158925972, 581176078, 2122180268, 7741354991, 28220983035, 102834056500, 374610934446, 1364401434376, 4968801680787, 18093653761189, 65883792000048 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250592

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -21*a(n-2) -32*a(n-3) +195*a(n-4) -160*a(n-5) -371*a(n-6) +679*a(n-7) +5*a(n-8) -716*a(n-9) +413*a(n-10) +152*a(n-11) -200*a(n-12) +48*a(n-13)

EXAMPLE

Some solutions for n=5

..0..0..2....1..0..1....0..0..0....0..0..0....0..0..1....2..2..2....0..0..1

..0..2..1....0..1..1....0..0..0....0..2..2....0..1..0....0..2..2....1..1..2

..2..1..2....1..1..1....0..0..1....2..2..2....1..0..1....2..1..2....0..1..2

..0..2..2....1..1..2....2..1..1....1..2..2....0..1..1....0..2..2....1..1..2

..2..0..2....1..1..2....1..2..2....1..2..2....0..1..2....2..1..2....1..1..2

..0..2..1....1..2..1....2..1..2....1..2..2....1..0..2....1..2..1....1..2..2

CROSSREFS

Sequence in context: A158218 A142287 A167574 * A201853 A142843 A290757

Adjacent sequences:  A250583 A250584 A250585 * A250587 A250588 A250589

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 25 2014

STATUS

approved

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Last modified October 17 07:39 EDT 2021. Contains 348048 sequences. (Running on oeis4.)