OFFSET
0,1
REFERENCES
A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = (7n+2)*C(n) where C(n)=Catalan numbers (A000108).
MATHEMATICA
Table[(7*n + 2)*CatalanNumber[n], {n, 0, 50}] (* G. C. Greubel, May 25 2018 *)
PROG
(PARI) for(n=0, 30, print1(((7*n+2)/(n+1))*binomial(2*n, n), ", ")) \\ G. C. Greubel, May 25 2018
(Magma) [((7*n+2)/(n+1))*Binomial(2*n, n): n in [0..30]]; // G. C. Greubel, May 25 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Barry E. Williams, Jan 06 2000
EXTENSIONS
Terms a(21) onward added by G. C. Greubel, May 25 2018
STATUS
approved