A013750 a(n) = 12^(3*n + 1).

12, 20736, 35831808, 61917364224, 106993205379072, 184884258895036416, 319479999370622926848, 552061438912436417593344, 953962166440690129601298432, 1648446623609512543951043690496, 2848515765597237675947403497177088, 4922235242952026704037113243122008064

Offset

0,1

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 (1728).

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 1728*a(n-1); a(0)=12.

G.f.: 12/(1-1728*x).

a(n) = A013751(n)/12. (End)

Mathematica

12^(3*Range[0, 15] + 1) (* Paolo Xausa, May 29 2026 *)

Prog

(Magma) [12^(3*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 27 2011
(PARI) a(n)=12^(3*n+1) \\ Charles R Greathouse IV, Jun 27 2011

Crossrefs

Subsequence of A001021.

Sequence in context: A175882 A216874 A012736 * A127395 A076807 A308139

Adjacent sequences: A013747 A013748 A013749 * A013751 A013752 A013753

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved