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 A135807 Tenth column (k=9) of triangle A134832 (circular succession numbers). 2
 1, 0, 0, 220, 715, 16016, 180180, 2619760, 39503750, 642172960, 11111964864, 204016477080, 3959206825210, 80952590044480, 1739019535313720, 39150661649469744, 921633956154372175, 22640304292494917600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS a(n) enumerates circular permutations of {1,2,...,n+9} with exactly nine successor pairs (i,i+1). Due to cyclicity also (n+9,1) is a successor pair. REFERENCES Ch. A. Charalambides, Enumerative Combinatorics, Chapman & Hall/CRC, Boca Raton, Florida, 2002, p. 183, eq. (5.15), for k=9. LINKS G. C. Greubel, Table of n, a(n) for n = 0..440 FORMULA a(n) = binomial(n+9,9)*A000757(n), n>=0. E.g.f.: (d^9/dx^9) (x^9/9!)*(1-log(1-x))/e^x. EXAMPLE a(0)=1 because from the 9!/9 = 40320 circular permutations of n=9 elements only one, namely (1,2,3,4,5,6,7,8,9), has nine successors. MATHEMATICA f[n_] := (-1)^n + Sum[(-1)^k*n!/((n - k)*k!), {k, 0, n - 1}]; a[n_, n_] = 1; a[n_, 0] := f[n]; a[n_, k_] := a[n, k] = n/k*a[n - 1, k - 1]; Table[a[n, 9], {n, 9, 25}] (* G. C. Greubel, Nov 10 2016 *) PROG (PARI) a(n)=((-1)^n + sum( k=0, n-1, (-1)^k * binomial( n, k) * (n - k - 1)!))*binomial(n+9, 9) \\ Charles R Greathouse IV, Nov 10 2016 CROSSREFS Cf. A135806 (column k=8). Sequence in context: A184543 A234558 A211816 * A258545 A257361 A258538 Adjacent sequences:  A135804 A135805 A135806 * A135808 A135809 A135810 KEYWORD nonn,easy AUTHOR Wolfdieter Lang Jan 21 2008, Feb 22 2008 STATUS approved

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Last modified December 4 17:03 EST 2021. Contains 349526 sequences. (Running on oeis4.)