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A060888 n^6-n^5+n^4-n^3+n^2-n+1. 4
1, 1, 43, 547, 3277, 13021, 39991, 102943, 233017, 478297, 909091, 1623931, 2756293, 4482037, 7027567, 10678711, 15790321, 22796593, 32222107, 44693587, 60952381, 81867661, 108450343, 141867727, 183458857, 234750601, 297474451 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = Phi_14(n) where Phi_k is the k-th cyclotomic polynomial.

Number of walks of length 7 between any two distinct nodes of the complete graph K_{n+1} (n>=1). - Emeric Deutsch, Apr 01 2004

LINKS

Harry J. Smith, Table of n, a(n) for n=0,...,1000

Index to values of cyclotomic polynomials of integer argument

Index to sequences with linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

G.f.=(1-6x+57x^2+232x^3+351x^4+78x^5+7x^6)/(1-x)^7. - Emeric Deutsch, Apr 01 2004

a(0)=1, a(1)=1, a(2)=43, a(3)=547, a(4)=3277, a(5)=13021, a(6)=39991, a(n)=7*a(n-1)-21*a(n-2)+35*a(n-3)-35*a(n-4)+21*a(n-5)- 7*a(n-6)+ a(n-7) -- From Harvey P. Dale, Jul 21 2012

MAPLE

A060888 := proc(n)

        numtheory[cyclotomic](14, n) ;

end proc:

seq(A060888(n), n=0..20) ; # R. J. Mathar, Feb 11 2014

MATHEMATICA

Table[1-n+n^2-n^3+n^4-n^5+n^6, {n, 0, 30}] (* or *) LinearRecurrence[ {7, -21, 35, -35, 21, -7, 1}, {1, 1, 43, 547, 3277, 13021, 39991}, 30] (* or *) Cyclotomic[14, Range[0, 30]] (* Harvey P. Dale, Jul 21 2012 *)

PROG

(PARI) { for (n=0, 1000, write("b060888.txt", n, " ", n^6 - n^5 + n^4 - n^3 + n^2 - n + 1); ) } [From Harry J. Smith, Jul 14 2009]

CROSSREFS

Sequence in context: A238202 A008388 A241939 * A245427 A229689 A146979

Adjacent sequences:  A060885 A060886 A060887 * A060889 A060890 A060891

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 05 2001

STATUS

approved

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Last modified September 19 18:00 EDT 2014. Contains 246977 sequences.