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A199415
11*6^n+1.
1
12, 67, 397, 2377, 14257, 85537, 513217, 3079297, 18475777, 110854657, 665127937, 3990767617, 23944605697, 143667634177, 862005805057, 5172034830337, 31032208982017, 186193253892097, 1117159523352577, 6702957140115457, 40217742840692737
OFFSET
0,1
FORMULA
a(n) = 6*a(n-1)-5.
a(n) = 7*a(n-1)-6*a(n-2).
G.f.: (12-17*x)/((1-x)*(1-6*x)).
MATHEMATICA
11*6^Range[0, 30]+1 (* or *) LinearRecurrence[{7, -6}, {12, 67}, 30] (* Harvey P. Dale, Mar 26 2012 *)
PROG
(Magma) [11*6^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A091074 A212687 A117088 * A200204 A289384 A200205
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 06 2011
STATUS
approved