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2, 9, 65, 626, 6918, 82500, 1033412, 13402697, 178405157, 2423307047, 33453694487, 467995871777, 6619846420553, 94520750408709, 1360510918810437, 19720133460129650, 287590328749420958, 4216819865806452984
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n)=sum(binomial(2k, k)/(k+1), k=0..2n+1). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 20 2004
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MAPLE
| a:=n->sum(binomial(2*k, k)/(k+1), k=0..2*n+1): seq(a(n), n=0..20); (Deutsch)
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CROSSREFS
| Cf. A014137, A099975.
Cf. A000108.
Sequence in context: A168383 A071300 A062395 * A127056 A042255 A152213
Adjacent sequences: A099972 A099973 A099974 * A099976 A099977 A099978
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2004
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 20 2004
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