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A275163
a(n) = 13*2^(n+1) - 19.
3
7, 33, 85, 189, 397, 813, 1645, 3309, 6637, 13293, 26605, 53229, 106477, 212973, 425965, 851949, 1703917, 3407853, 6815725, 13631469, 27262957, 54525933, 109051885, 218103789, 436207597, 872415213, 1744830445, 3489660909, 6979321837, 13958643693
OFFSET
0,1
COMMENTS
Most terms in even positions of A278066 are terms in this sequence.
FORMULA
a(0) = 7; a(n) = 2*a(n-1) + 19 for n>=1.
G.f.: (12*x+7)/((1-2*x)*(1-x)).
MATHEMATICA
NestList[2#+19&, 7, 30] (* or *) LinearRecurrence[{3, -2}, {7, 33}, 30] (* Harvey P. Dale, Aug 08 2021 *)
CROSSREFS
Cf. A278066.
Sequence in context: A175189 A153286 A060745 * A051895 A168574 A212106
KEYWORD
nonn
AUTHOR
Nathan Fox, Nov 13 2016
STATUS
approved