A013750 a(n) = 12^(3*n + 1).
12, 20736, 35831808, 61917364224, 106993205379072, 184884258895036416, 319479999370622926848, 552061438912436417593344, 953962166440690129601298432, 1648446623609512543951043690496
Offset: 0
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).
Crossrefs
Subsequence of A001021.
Programs
-
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
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)