A059155 A hierarchical sequence (S(W'2{3}c) - see A059126).

12, 120, 1008, 8160, 65472, 524160, 4194048, 33553920, 268434432, 2147481600, 17179865088, 137438945280, 1099511611392, 8796092989440, 70368744112128, 562949953290240, 4503599627108352, 36028797018439680, 288230376150663168, 2305843009211596800, 18446744073705357312

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

J. Wallgren, Hierarchical sequences

Index entries for linear recurrences with constant coefficients, signature (10, -16).

Formula

G.f.: 12/((8*x-1)*(2*x-1)). [Maksym Voznyy (voznyy(AT)mail.ru), Jul 27 2009]

a(n) = 2^(n+2)*(4^(n+1)-1). - Peter Luschny, May 08 2014

Mathematica

CoefficientList[Series[12/((8 x - 1) (2 x - 1)), {x, 0, 40}], x] (* Vincenzo Librandi, May 09 2014 *)

Crossrefs

Sequence in context: A067358 A268634 A061506 * A012443 A012274 A009035

Adjacent sequences: A059152 A059153 A059154 * A059156 A059157 A059158

Keyword

nonn,easy

Author

Jonas Wallgren, Feb 02 2001

Extensions

More terms from Peter Luschny, May 08 2014

Status

approved