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A050489
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C(n)*(10n+1) where C(n)=Catalan numbers (A000108).
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1
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1, 11, 42, 155, 574, 2142, 8052, 30459, 115830, 442442, 1696396, 6525246, 25169452, 97319900, 377096040, 1463921595, 5692584870, 22169259090, 86452604700, 337547269290, 1319388204420, 5162382341220, 20217646564440, 79246770753150, 310866899505084
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
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MATHEMATICA
| Table[CatalanNumber[n](10n+1), {n, 0, 30}] (* From Harvey P. Dale, Jul 19 2011 *)
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CROSSREFS
| Cf. A017173, A027810 and A000108.
Sequence in context: A055436 A062517 A027978 * A156533 A096638 A089712
Adjacent sequences: A050486 A050487 A050488 * A050490 A050491 A050492
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KEYWORD
| easy,nonn
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AUTHOR
| Barry E. Williams, Dec 27 1999
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EXTENSIONS
| Corrected and extended by Harvey P. Dale, Jul 19 2011
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