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A250513 Number of (n+1)X(2+1) 0..3 arrays with nondecreasing min(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
889, 14660, 205022, 2817780, 36999777, 480626844, 6146257386, 78207667892, 989461227857, 12490767516140, 157338705492038, 1979999186165612, 24895912443954313, 312904888051577996, 3931444944701135850 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A250519
LINKS
FORMULA
Empirical: a(n) = 20*a(n-1) -25*a(n-2) -1400*a(n-3) +5769*a(n-4) +23616*a(n-5) -132975*a(n-6) -127632*a(n-7) +1074132*a(n-8) +385732*a(n-9) -4202228*a(n-10) -1161728*a(n-11) +8517056*a(n-12) +2583408*a(n-13) -9166944*a(n-14) -3219264*a(n-15) +4980096*a(n-16) +2018304*a(n-17) -1078272*a(n-18) -497664*a(n-19)
EXAMPLE
Some solutions for n=2
..0..3..0....1..0..2....2..0..3....1..0..3....3..0..3....2..1..1....2..0..1
..0..0..2....0..1..2....0..0..2....0..1..3....0..0..1....1..2..2....0..1..3
..3..3..2....0..1..1....2..0..2....2..2..1....1..2..2....3..2..3....2..1..3
CROSSREFS
Sequence in context: A183751 A231954 A224338 * A252577 A202528 A006916
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 24 2014
STATUS
approved

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Last modified May 22 15:18 EDT 2024. Contains 372758 sequences. (Running on oeis4.)