3,1

Table of n, a(n) for n=3..9.

a(n)=1+(n^9-9n^8+6n^7+180n^6-663n^5+369n^4+3536n^3-8964n^2+2952n)/1296

Cf. A055503

Sequence in context: A108475 A098624 A116079 * A208974 A294196 A275794

Adjacent sequences: A153442 A153443 A153444 * A153446 A153447 A153448

nonn

Alexander Evnin, Dec 26 2008

approved