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A013984 Expansion of 1/(1-x^2-x^3-x^4-x^5-x^6-x^7). 4
1, 0, 1, 1, 2, 3, 5, 8, 12, 20, 31, 50, 79, 126, 200, 318, 506, 804, 1279, 2033, 3233, 5140, 8173, 12995, 20662, 32853, 52236, 83056, 132059, 209975, 333861, 530841, 844040, 1342028, 2133832, 3392804, 5394577 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Number of compositions of n into parts p where 2 <= p < = 7. [Joerg Arndt, Jun 24 2013]

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (0,1,1,1,1,1,1)

MATHEMATICA

CoefficientList[Series[1 / (1 - x^2 - x^3 - x^4 - x^5 - x^6 - x^7), {x, 0, 40}], x] (* Vincenzo Librandi, Jun 23 2013 *)

PROG

(PARI) Vec(1/(1-x^2-x^3-x^4-x^5-x^6-x^7)+O(x^99)) \\ Charles R Greathouse IV, Sep 25 2012

(MAGMA) m:=40; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/(1-x^2-x^3-x^4-x^5-x^6-x^7))); // Vincenzo Librandi, Jun 24 2013

CROSSREFS

Sequence in context: A179018 A205476 A170805 * A107479 A117761 A274376

Adjacent sequences:  A013981 A013982 A013983 * A013985 A013986 A013987

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 16 12:25 EDT 2021. Contains 343947 sequences. (Running on oeis4.)