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1, 4, 23, 197, 2056, 23714, 290512, 3707852, 48760367, 656043857, 8987427467, 124936258127, 1757900019101, 24987199492705, 358268702159069, 5175497420902741, 75254198337177848, 1100534370899151722
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=sum(binomial(2k, k)/(k+1), k=0..2n). - 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): seq(a(n), n=0..20); (Deutsch)
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CROSSREFS
| Cf. A014137, A099975.
Cf. A000108.
Sequence in context: A192840 A186117 A108953 * A056785 A188404 A105747
Adjacent sequences: A099866 A099867 A099868 * A099870 A099871 A099872
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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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