A088930 Sum of first n terms of A(x)^n is A087457(n) for n>=1.

1, 2, 4, 9, 23, 67, 220, 795, 3086, 12633, 53844, 236833, 1068313, 4919512, 23047579, 109563206, 527401808, 2566472416, 12608536729, 62465984781, 311796289951, 1566778163225, 7920718997762, 40261922412697, 205675725994566

Offset

0,2

Comments

A087457 gives number of odd length roads between any adjacent nodes in virtual optimal chordal ring of degree 3.

Links

Table of n, a(n) for n=0..24.

Example

Given a(1)=1 and a(1)=2, then a(2)=4 since sum of first 3 coefficients of
A(x)^3=1+6x+24x^2+... equals 1+6+24 = 31 = A087457(3).

Crossrefs

Cf. A087457, A088929.

Sequence in context: A117419 A124461 A026898 * A225588 A089844 A113997

Adjacent sequences: A088927 A088928 A088929 * A088931 A088932 A088933

Keyword

nonn

Author

Paul D. Hanna, Oct 24 2003

Status

approved