A188527 a(n) = A188526(n) / 7.

4, 35, 313, 2813, 25309, 227765, 2049853, 18448613, 166037389, 1494336245, 13449025693, 121041230213, 1089371069869, 9804339624725, 88239056614333, 794151509512613, 7147363585580749, 64326272270161205, 578936450431319773, 5210428053881615813, 46893852484934018029

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..500

Formula

a(n) = (3^(2*n + 3) + 2^n) / 7.

Prog

(Magma) [(3^(2*n + 3) + 2^n)/7: n in [0..20]]; // Vincenzo Librandi, Jul 17 2011

Crossrefs

Sequence in context: A104526 A174436 A145607 * A292190 A026304 A215541

Adjacent sequences: A188524 A188525 A188526 * A188528 A188529 A188530

Keyword

nonn,easy

Author

Reinhard Zumkeller, Apr 03 2011

Status

approved