login
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
OFFSET
1,1
COMMENTS
Row 1 of A250707
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 26 2014
STATUS
approved