0,1

a(n)= (n+1)*(n+2)*(n^6+45*n^5+745*n^4+5595*n^3+18694*n^2+22440*n+7200)/2880. 2880=8!/(2*7).

G.f.: (5+69*x-75*x^2-20*x^3+60*x^4-30*x^5+5*x^6)/(1-x)^9.

Cf. A090454, A091027.

Sequence in context: A009678 A009691 A053712 this_sequence A089638 A109057 A080988

Adjacent sequences: A091023 A091024 A091025 this_sequence A091027 A091028 A091029

nonn,easy

Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Dec 23 2003