A015496 a(0)=1, a(1)=8, a(n) = sum_{k=0}^{k=n-1} 8^k a(k).

1, 8, 65, 4225, 2167425, 8879940225, 290986761233025, 76280724523431338625, 159972350276487602091434625, 2683890834588642498097652544938625, 360225732702402245287553744812732691882625

Offset

0,2

Links

Table of n, a(n) for n=0..10.

Formula

a(n) = (8^(n-2) + 1) * a(n-1). - Vincenzo Librandi, Nov 11 2012

Prog

(Magma) I:=[1, 8, 65]; [n le 3 select I[n] else (8^(n-2)+1)*Self(n-1): n in [1..15]]; // Vincenzo Librandi, Nov 11 2012

Crossrefs

Sequence in context: A041114 A360847 A320990 * A226126 A039329 A230736

Adjacent sequences: A015493 A015494 A015495 * A015497 A015498 A015499

Keyword

nonn,easy

Author

Olivier Gérard

Status

approved