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A253209
a(n) = 6^n + 5.
2
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.
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.
Sequence in context: A243139 A288822 A015440 * A193488 A270223 A270691
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 29 2014
STATUS
approved