OFFSET
0,2
REFERENCES
J. Riordan, Combinatorial Identities, Wiley, 1968, p. 217.
FORMULA
E.g.f.: (arcsin x)^6; that is, a_k is the coefficient of x^(2*k+6) in (arcsin x)^6 multiplied by (2*k+6)! and divided by 6!. - Joe Keane (jgk(AT)jgk.org)
(-1)^(n-2)*a(n-2) is the coefficient of x^5 in prod(k=0, 2*n, x+2*k-2*n). - Benoit Cloitre and Michael Somos, Nov 22 2002
EXAMPLE
(arcsin x)^6 = x^6 + x^8 + 13/15*x^10 + 139/189*x^12 + ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Joe Keane (jgk(AT)jgk.org)
STATUS
approved