0,2

a(n)= 1+3*n+5*n^2+5*n^3. Fourth row polynomial (n=3) of Catalan triangle A009766.

G.f.: (1+2*x)*(1+8*x+x^2)/(1-x)^4.

A001844 (fourth diagonal).

Sequence in context: A124892 A126401 A058092 this_sequence A071616 A008529 A075480

Adjacent sequences: A064093 A064094 A064095 this_sequence A064097 A064098 A064099

nonn,easy

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Sep 13 2001