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

Author

Vincenzo Librandi, Dec 29 2014

Keywords

• nonn
• easy

Comments

Subsequence of A226814.

Links

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

Crossrefs

Cf. similar sequences listed in A253208.

Cf. A164784, A226814.

Programs

Magma

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

Mathematica

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

Formula

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

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