OFFSET
0,4
REFERENCES
George Boros and Victor H. Moll, Irresistible integrals, Cambridge University Press (2006), p. 63.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..250
MATHEMATICA
Table[2^(2*n)*(2^(2*n)-1)/(2*n)! // Denominator, {n, 0, 20}]
PROG
(Magma) [Denominator(2^(2*n)*(2^(2*n)-1)/Factorial(2*n)): n in [0..20]]; // Vincenzo Librandi, Jul 17 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Jean-François Alcover, May 17 2013
STATUS
approved