A013717 a(n) = 12^(2*n + 1).

12, 1728, 248832, 35831808, 5159780352, 743008370688, 106993205379072, 15407021574586368, 2218611106740436992, 319479999370622926848, 46005119909369701466112, 6624737266949237011120128

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..200
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (144).

Crossrefs

Bisection of A001021.

Cf. A013708-A013716, A013718-A013729.

Programs

Magma

[12^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011

Maple

seq(12^(2*n+1),n=0..11); # Nathaniel Johnston, Jun 25 2011

PARI

a(n)=12^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016

Formula

From Philippe Deléham, Nov 25 2008: (Start)

a(n) = 144*a(n-1), a(0)=12.

G.f.: 12/(1-144*x). (End)