A253209 a(n) = 6^n + 5.

6, 11, 41, 221, 1301, 7781, 46661, 279941, 1679621, 10077701, 60466181, 362797061, 2176782341, 13060694021, 78364164101, 470184984581, 2821109907461, 16926659444741, 101559956668421, 609359740010501, 3656158440062981, 21936950640377861, 131621703842267141

Offset

0,1

Comments

Subsequence of A226814.

Links

Table of n, a(n) for n=0..22.

Index entries for linear recurrences with constant coefficients, signature (7,-6).

Formula

G.f.: (6 - 31*x) / ((1 - x)*(1 - 6*x)).

a(n) = 7*a(n-1) - 6*a(n-2) for n>1.

Mathematica

Table[6^n + 5, {n, 0, 30}]

Prog

(Magma) [6^n+5: n in [0..30]];

Crossrefs

Cf. similar sequences listed in A253208.

Cf. A164784, A226814.

Sequence in context: A243139 A288822 A015440 * A193488 A270223 A270691

Adjacent sequences: A253206 A253207 A253208 * A253210 A253211 A253212

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 29 2014

Status

approved