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A246987 Expansion of (1-11*x+34*x^2-21*x^3+2*x^4)/((1-x)*(1-2*x)*(1-4*x)*(1-5*x)*(1-6*x)). 1
1, 7, 39, 206, 1087, 5832, 31949, 178486, 1013667, 5832452, 33896809, 198496866, 1168995647, 6913808272, 41021119269, 243974552846, 1453712656027, 8674107635292, 51813825111329, 309768931954426, 1853203840458807, 11092815661905512, 66427422581744989, 397927440625389606, 2384420217810707987 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
A. Prasad, Equivalence classes of nodes in trees and rational generating functions, arXiv preprint arXiv:1407.5284 [math.CO], 2014
FORMULA
a(n) = (1 - 3*2^(2+n) + 7*2^(1+2*n) + 3*5^n + 6^(1+n)) / 12. - Colin Barker, Jun 06 2015
PROG
(PARI) Vec((2*x^4-21*x^3+34*x^2-11*x+1)/(-240*x^5+508*x^4-372*x^3+121*x^2-18*x+1) + O(x^40)) \\ Colin Barker, Jun 06 2015
CROSSREFS
Sequence in context: A026708 A016127 A099460 * A322876 A092923 A164550
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Sep 15 2014
STATUS
approved

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)