login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A013886
a(n) = 18^(5*n + 1).
1
18, 34012224, 64268410079232, 121439531096594251776, 229468251895129407139872768, 433595865796975883590475106484224, 819308872942260126404286866009182175232, 1548139828427760582529495524831238344488779776, 2925315479322586708409093799864313376118974623776768
OFFSET
0,1
FORMULA
a(n) = 1889568*a(n-1), a(0)=18. - Vincenzo Librandi, May 27 2011
MATHEMATICA
18^(5*Range[0, 20]+1) (* or *) NestList[1889568#&, 18, 10] (* Harvey P. Dale, Oct 29 2016 *)
PROG
(Magma) [18^(5*n+1): n in [0..10]]; // Vincenzo Librandi, May 27 2011
(PARI) a(n) = 18^(5*n+1); \\ Seiichi Manyama, Aug 15 2023
CROSSREFS
Cf. A001027.
Sequence in context: A013808 A115479 A144838 * A259327 A271975 A186729
KEYWORD
nonn
STATUS
approved