A016282 Expansion of 1/((1-2*x)*(1-4*x)*(1-5*x)).

1, 11, 83, 535, 3171, 17871, 97483, 520055, 2731091, 14179231, 72992283, 373347975, 1900290211, 9635660591, 48715157483, 245723238295, 1237206060531, 6220389909951, 31239388241083, 156746696495015, 785932504682051, 3938458614335311, 19727477439571083

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..300

Index entries for linear recurrences with constant coefficients, signature (11,-38,40).

Formula

a(n) = (2/3)*2^n - 8*(4)^n + (25/3)*5^n. - Antonio Alberto Olivares, May 12 2012

Mathematica

CoefficientList[ Series[ 1/((1 - 2x)(1 - 4x)(1 - 5x)), {x, 0, 20} ], x ]
LinearRecurrence[{11, -38, 40}, {1, 11, 83}, 30] (* Harvey P. Dale, Nov 29 2022 *)

Prog

(Sage) [(5^n - 2^n)/3-(4^n - 2^n)/2 for n in range(2, 21)] # Zerinvary Lajos, Jun 05 2009
(PARI) Vec(1/((1-2*x)*(1-4*x)*(1-5*x))+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012

Crossrefs

Cf. A006516, A016127, A016129, A016130, A016311, A016316, A016321, A016325. - Zerinvary Lajos, Jun 05 2009

Sequence in context: A030692 A294831 A055369 * A068848 A167577 A129077

Adjacent sequences: A016279 A016280 A016281 * A016283 A016284 A016285

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved