A015492 a(0)=1, a(1)=6, a(n) = sum_{k=0}^{k=n-1} 6^k a(k).

1, 6, 37, 1369, 297073, 385303681, 2996506727137, 139808014368031009, 39137436118143496566433, 65735903040447825272422496161, 662466512863011927404416372294221217, 40056817423347655955546590948840276184277409

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Formula

a(n) = (6^(n-2) + 1) * a(n-1). - Vincenzo Librandi, Nov 11 2012

Prog

(Magma) I:=[1, 6, 37]; [n le 3 select I[n] else (6^(n-2)+1)*Self(n-1): n in [1..15]]; // Vincenzo Librandi, Nov 11 2012

Crossrefs

Sequence in context: A285934 A083373 A320988 * A243843 A039293 A055713

Adjacent sequences: A015489 A015490 A015491 * A015493 A015494 A015495

Keyword

nonn,easy

Author

Olivier Gérard

Status

approved