OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
Equals expansion of e.g.f. 1/(7-exp(x)-exp(2*x)-exp(3*x)-exp(4*x)-exp(5*x)-exp(6*x)).
a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * (1 + 2^k + ... + 6^k) * a(n-k). - Ilya Gutkovskiy, Jan 15 2020
MATHEMATICA
With[{nn=20}, CoefficientList[Series[1/(7-Exp[x]-Exp[2*x]-Exp[3*x]-Exp[4*x]-Exp[5*x]-Exp[6*x]), {x, 0, nn}], x] Range[0, nn]!] (* Vincenzo Librandi, Jun 14 2012 *)
PROG
(PARI) x='x+O('x^30); Vec(serlaplace(1/(7-sum(k=1, 6, exp(k*x))))) \\ G. C. Greubel, Oct 09 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(1/(7-Exp(x)-Exp(2*x)-Exp(3*x)-Exp(4*x)-Exp(5*x)-Exp(6*x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Oct 09 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved