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A024501 [ C(4n,2n)/C(4n,n) ]. 0
1, 1, 2, 4, 7, 11, 20, 33, 57, 96, 162, 274, 462, 780, 1317, 2223, 3751, 6329, 10680, 18021, 30409, 51312, 86584, 146103, 246538, 416013, 701993, 1184566, 1998882, 3372999, 5691754, 9604549, 16207222, 27348969, 46150243, 77876717, 131414064 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..36.

CROSSREFS

Sequence in context: A080005 A151992 A242362 * A160393 A018173 A288380

Adjacent sequences:  A024498 A024499 A024500 * A024502 A024503 A024504

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from James A. Sellers, Feb 06 2000

STATUS

approved

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Last modified August 10 03:47 EDT 2020. Contains 336368 sequences. (Running on oeis4.)