OFFSET
0,2
REFERENCES
Albert H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
FORMULA
From R. J. Mathar, Feb 13 2015: (Start)
5*(n+1)*a(n) + (-29*n-1)*a(n-1) + 18*(2*n-3)*a(n-2) = 0.
-(n+1)*(11*n-10)*a(n) + 2*(11*n+1)*(2*n-1)*a(n-1) = 0. (End)
G.f.: (5 - 9*x - 5*sqrt(1 - 4*x))/(x*sqrt(1 - 4*x)). - Amiram Eldar, Jul 08 2023
MATHEMATICA
Table[CatalanNumber[n](11n+1), {n, 0, 20}] (* Harvey P. Dale, Jul 12 2018 *)
PROG
(Magma) [Catalan(n)*(11*n+1):n in [0..25] ]; // Marius A. Burtea, Jan 05 2020
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Barry E. Williams, Dec 27 1999
EXTENSIONS
Terms a(21) and beyond from Andrew Howroyd, Jan 05 2020
STATUS
approved