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A028303 a(n) = floor((1/(ceiling(n/2)+1))*binomial(n,floor(n/2))) (interpolates between Catalan numbers). 0
1, 0, 1, 1, 2, 2, 5, 7, 14, 21, 42, 66, 132, 214, 429, 715, 1430, 2431, 4862, 8398, 16796, 29393, 58786, 104006, 208012, 371450, 742900, 1337220, 2674440, 4847422, 9694845, 17678835, 35357670, 64822395 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

REFERENCES

D. Miklos et al., eds., Combinatorics, Paul Erdős is Eighty, Bolyai Math. Soc., 1993, Vol. 1, p. 101.

LINKS

Table of n, a(n) for n=0..33.

CROSSREFS

Sequence in context: A036378 A265813 A259864 * A255063 A195964 A047083

Adjacent sequences:  A028300 A028301 A028302 * A028304 A028305 A028306

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified June 20 16:26 EDT 2019. Contains 324234 sequences. (Running on oeis4.)