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A090010 Permanent of (0,1)-matrix of size n X (n+d) with d=6 and n zeros not on a line. 12
6, 43, 356, 3333, 34754, 398959, 4996032, 67741129, 988344062, 15434831091, 256840738076, 4536075689293, 84731451264186, 1668866557980343, 34563571477305464, 750867999393119889, 17072113130285524982, 405423357986250112699, 10037458628015142154452 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Brualdi, Richard A. and Ryser, Herbert J., Combinatorial Matrix Theory, Cambridge NY (1991), Chapter 7.

Seok-Zun Song et al., Extremes of permanents of (0,1)-matrices, Lin. Algebra and its Applic. 373 (2003), p. 197-210.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

FORMULA

a(n) = (n+5)*a(n-1) + (n-1)*a(n-2), a(1)=6, a(2)=43

G.f.: -1+hypergeom([1,7],[],x/(x+1))/(x+1) - Mark van Hoeij, Nov 07 2011

E.g.f.: -1 + exp(-x)/(1-x)^7. - Vaclav Kotesovec, Oct 21 2012

a(n) ~ n!*n^6/(720*e). - Vaclav Kotesovec, Oct 21 2012

MAPLE

A090010 := proc(n, d) local r; if (n=1) then r := d elif (n=2) then r := d^2+d+1 else r := (n+d-1)*A090010(n-1, d)+(n-1)*A090010(n-2, d) fi; RETURN(r); end: seq(A090010(n, 6), n=1..18);

MATHEMATICA

Rest[CoefficientList[Series[E^(-x)/(1-x)^7, {x, 0, 20}], x]*Range[0, 20]!] (* Vaclav Kotesovec, Oct 21 2012 *)

PROG

(PARI) x='x+O('x^66); Vec(serlaplace(-1+exp(-x)/(1-x)^7)) \\ Joerg Arndt, May 11 2013

CROSSREFS

Cf. A000255, A000153, A000261, A001909, A001910, A055790, A090012-A090016.

Sequence in context: A146966 A240653 A220097 * A176732 A062266 A217485

Adjacent sequences:  A090007 A090008 A090009 * A090011 A090012 A090013

KEYWORD

nonn,easy

AUTHOR

Jaap Spies, Dec 13 2003

EXTENSIONS

Corrected by Jaap Spies, Jan 26 2004

STATUS

approved

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Last modified November 26 10:56 EST 2014. Contains 250056 sequences.