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A275163 a(n) = 13*2^(n+1) - 19. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Most terms in even positions of A278066 are terms in this sequence.

LINKS

Table of n, a(n) for n=0..29.

FORMULA

a(0) = 7; a(n) = 2*a(n-1) + 19 for n>=1.

G.f.: (12*x+7)/((1-2*x)*(1-x)).

CROSSREFS

Cf. A278066.

Sequence in context: A175189 A153286 A060745 * A051895 A168574 A212106

Adjacent sequences:  A275160 A275161 A275162 * A275164 A275165 A275166

KEYWORD

nonn

AUTHOR

Nathan Fox, Nov 13 2016

STATUS

approved

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Last modified July 14 10:07 EDT 2020. Contains 335721 sequences. (Running on oeis4.)