OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..100
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (194481).
PROG
(Magma) [21^(4*n+1): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011
(Maxima) makelist(21^(4*n+1), n, 0, 20); /* Martin Ettl, Oct 21 2012 */
(PARI) a(n) = 21^(4*n+1); \\ Altug Alkan, Sep 08 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved