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A055276 First differences of 11^n (A001020). 5
1, 10, 110, 1210, 13310, 146410, 1610510, 17715610, 194871710, 2143588810, 23579476910, 259374246010, 2853116706110, 31384283767210, 345227121439310, 3797498335832410, 41772481694156510, 459497298635721610 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) is the number of compositions of n when there are 10 types of each natural number. - Milan Janjic, Aug 13 2010

Apart from the first term, number of monic squarefree polynomials over F_11 of degree n. - Charles R Greathouse IV, Feb 07 2012

REFERENCES

A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.

LINKS

Table of n, a(n) for n=0..17.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Index entries for linear recurrences with constant coefficients, signature (11).

FORMULA

a(n) = 11a(n-1) + ((-1)^n)*C(1, 1-n).

a(n) = 10*11^(n-1); a(0)=1.

G.f.: (1-x)/(1-11x).

MATHEMATICA

Table[EulerPhi[11^n], {n, 0, 40}] (* Vladimir Joseph Stephan Orlovsky, Nov 10 2009 *)

PROG

(PARI) a(n)=round(11^n*10/11) \\ Charles R Greathouse IV, Feb 07 2012

CROSSREFS

Cf. A001020.

Sequence in context: A289933 A289967 A057093 * A264915 A289414 A143749

Adjacent sequences:  A055273 A055274 A055275 * A055277 A055278 A055279

KEYWORD

easy,nonn

AUTHOR

Barry E. Williams, May 29 2000

STATUS

approved

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Last modified May 24 09:41 EDT 2019. Contains 323529 sequences. (Running on oeis4.)