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A250708 Number of (1+1)X(n+1) 0..3 arrays with nondecreasing 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
100, 654, 3674, 19876, 102963, 521684, 2597784, 12791393, 62471749, 303365393, 1467083010, 7073825450, 34034432454, 163494484120, 784498580843, 3761138943767, 18021126036602, 86307928183894, 413216314086236 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 1 of A250707

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -25*a(n-2) -30*a(n-3) +166*a(n-4) -43*a(n-5) -343*a(n-6) +230*a(n-7) +301*a(n-8) -287*a(n-9) -110*a(n-10) +159*a(n-11) +5*a(n-12) -41*a(n-13) +6*a(n-14) +4*a(n-15) -a(n-16)

EXAMPLE

Some solutions for n=4

..3..0..0..0..2....0..1..1..1..1....1..0..0..3..2....0..2..0..2..3

..0..3..2..1..3....3..0..2..3..3....0..1..2..2..3....3..0..3..2..3

CROSSREFS

Sequence in context: A231759 A231046 A250707 * A235856 A235850 A264539

Adjacent sequences:  A250705 A250706 A250707 * A250709 A250710 A250711

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 26 2014

STATUS

approved

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Last modified September 25 12:03 EDT 2020. Contains 337343 sequences. (Running on oeis4.)