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A199321
7*6^n+1.
1
8, 43, 253, 1513, 9073, 54433, 326593, 1959553, 11757313, 70543873, 423263233, 2539579393, 15237476353, 91424858113, 548549148673, 3291294892033, 19747769352193, 118486616113153, 710919696678913, 4265518180073473, 25593109080440833
OFFSET
0,1
FORMULA
a(n) = 6*a(n-1)-5.
a(n) = 7*a(n-1)-6*a(n-2).
G.f.: (8-13*x)/((1-x)*(1-6*x)).
PROG
(Magma) [7*6^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A034361 A117617 A111365 * A346198 A144039 A282189
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 06 2011
STATUS
approved