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A115618 1 + (n+6)*2^(n-1). 2
4, 8, 17, 37, 81, 177, 385, 833, 1793, 3841, 8193, 17409, 36865, 77825, 163841, 344065, 720897, 1507329, 3145729, 6553601, 13631489, 28311553, 58720257, 121634817, 251658241, 520093697, 1073741825, 2214592513, 4563402753, 9395240961, 19327352833, 39728447489 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

R. J. Lang, Origami approximate geometric constructions, in Tribute to a Mathemagician, Peters, 2005, pp. 223-239.

LINKS

Table of n, a(n) for n=0..31.

MATHEMATICA

Table[1 + (n + 6)*2^(n - 1), {n, 0, 40}] (* T. D. Noe, Apr 01 2013 *)

PROG

(PARI) a(n) = 1 + (n+6)*2^(n-1) \\ Michel Marcus, Apr 01 2013

CROSSREFS

Sequence in context: A005697 A215108 A307545 * A019479 A084814 A098125

Adjacent sequences:  A115615 A115616 A115617 * A115619 A115620 A115621

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 11 2006

STATUS

approved

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Last modified November 28 04:31 EST 2021. Contains 349400 sequences. (Running on oeis4.)