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 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified December 5 05:37 EST 2023. Contains 367575 sequences. (Running on oeis4.)