A077833 Expansion of 1/(1-2*x-3*x^2-2*x^3).

1, 2, 7, 22, 69, 218, 687, 2166, 6829, 21530, 67879, 214006, 674709, 2127194, 6706527, 21144054, 66662077, 210169370, 662613079, 2089058422, 6586294821, 20764991066, 65466983439, 206401529718, 650733991885, 2051606539802, 6468218114695, 20392723832566

Offset

0,2

Links

Table of n, a(n) for n=0..27.

Index entries for linear recurrences with constant coefficients, signature (2,3,2).

Mathematica

CoefficientList[Series[1/(1-2x-3x^2-2x^3), {x, 0, 30}], x] (* or *) LinearRecurrence[{2, 3, 2}, {1, 2, 7}, 30] (* Harvey P. Dale, Sep 07 2017 *)

Prog

(PARI) Vec(1/(1-2*x-3*x^2-2*x^3)+O(x^99)) \\ Charles R Greathouse IV, Sep 27 2012

Crossrefs

Partial sums of S(n, x), x=1..19 see A077832 and A-number references.

First differences of A077826.

Sequence in context: A333494 A292399 A094618 * A106438 A291382 A109999

Adjacent sequences: A077830 A077831 A077832 * A077834 A077835 A077836

Keyword

nonn,easy

Author

N. J. A. Sloane, Nov 17 2002

Status

approved