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A050491 C(n)*(12n+1) where C(n)=Catalan numbers (A000108). 0
1, 13, 50, 185, 686, 2562, 9636, 36465, 138710, 529958, 2032316, 7818538, 30161740, 116635300, 451980360, 1754766945, 6824030310, 26577181950, 103647597900, 404703270510, 1581953021220 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Cf. A017401, A027810, A000108.

Sequence in context: A050410 A121991 A121990 * A022283 A135971 A146143

Adjacent sequences:  A050488 A050489 A050490 * A050492 A050493 A050494

KEYWORD

easy,nonn

AUTHOR

Barry E. Williams, Dec 27 1999

STATUS

approved

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Last modified February 18 03:43 EST 2018. Contains 299298 sequences. (Running on oeis4.)