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A115618 1 + (n+6)*2^(n-1). 2

%I

%S 4,8,17,37,81,177,385,833,1793,3841,8193,17409,36865,77825,163841,

%T 344065,720897,1507329,3145729,6553601,13631489,28311553,58720257,

%U 121634817,251658241,520093697,1073741825,2214592513,4563402753,9395240961,19327352833,39728447489

%N 1 + (n+6)*2^(n-1).

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

%t Table[1 + (n + 6)*2^(n - 1), {n, 0, 40}] (* _T. D. Noe_, Apr 01 2013 *)

%o (PARI) a(n) = 1 + (n+6)*2^(n-1) \\ _Michel Marcus_, Apr 01 2013

%K nonn

%O 0,1

%A _N. J. A. Sloane_, Apr 11 2006

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Last modified January 28 06:26 EST 2022. Contains 350654 sequences. (Running on oeis4.)