

A088930


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


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
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OFFSET

0,2


COMMENTS

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


LINKS



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



KEYWORD

nonn


AUTHOR



STATUS

approved



