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A100720 G.f.: (3+x+2*x^2-2*x^3)/((1-2*x)*(1+x^2)). 0
3, 7, 13, 23, 47, 97, 193, 383, 767, 1537, 3073, 6143, 12287, 24577, 49153, 98303, 196607, 393217, 786433, 1572863, 3145727, 6291457, 12582913, 25165823, 50331647, 100663297, 201326593, 402653183, 805306367, 1610612737, 3221225473, 6442450943, 12884901887 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..32.

Index entries for linear recurrences with constant coefficients, signature (2,-1,2).

FORMULA

a(0)=3 and for n>1: a(n)= 3*2^n+1 if n(mod 4)=1 or 2; otherwise 3*2^n-1. - R. Piyo (nagoya314(AT)yahoo.com), Dec 12 2004

CROSSREFS

Sequence in context: A048462 A048465 A049112 * A084898 A147380 A146606

Adjacent sequences:  A100717 A100718 A100719 * A100721 A100722 A100723

KEYWORD

nonn,easy

AUTHOR

Creighton Dement, Dec 06 2004

STATUS

approved

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Last modified September 26 10:43 EDT 2017. Contains 292518 sequences.