0,2

a(n) = (5^n/n!)*A008548(n), n >= 1, a(0) := 1, where A008548(n)=(5*n-4)(!^5) := product(5*j-4, j=1..n).

G.f.: (1-25*x)^(-1/5).

a(n) ~ Gamma(1/5)^-1*n^(-4/5)*5^(2*n)*{1 - 2/25*n^-1 - ...}. - Joe Keane (jgk(AT)jgk.org), Nov 24 2001

Cf. A008548, A034385, A034687.

Sequence in context: A105494 A030986 A091882 this_sequence A132855 A051481 A011918

Adjacent sequences: A034685 A034686 A034687 this_sequence A034689 A034690 A034691

easy,nonn

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)