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A199209
a(n) = 10*4^n+1.
2
11, 41, 161, 641, 2561, 10241, 40961, 163841, 655361, 2621441, 10485761, 41943041, 167772161, 671088641, 2684354561, 10737418241, 42949672961, 171798691841, 687194767361, 2748779069441, 10995116277761, 43980465111041
OFFSET
0,1
COMMENTS
Bisection (odd part) of A083575. - Bruno Berselli, Nov 04 2011
FORMULA
a(n) = 4*a(n-1)-3.
a(n) = 5*a(n-1)-4*a(n-2).
G.f.: (11-14*x)/((1-x)*(1-4*x)). - Bruno Berselli, Nov 04 2011
MATHEMATICA
10*4^Range[0, 30]+1 (* or *) LinearRecurrence[{5, -4}, {11, 41}, 30] (* Harvey P. Dale, May 27 2019 *)
PROG
(Magma) [10*4^n+1: n in [0..30]];
CROSSREFS
Cf. A083575.
Sequence in context: A243892 A288795 A213659 * A156733 A079304 A260270
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 04 2011
STATUS
approved