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A191637 a(n) = floor((1 + 4^n)/(1 + 2*n)). 2
1, 3, 9, 28, 93, 315, 1092, 3855, 13797, 49932, 182361, 671088, 2485513, 9256395, 34636833, 130150524, 490853405, 1857283155, 7048151460, 26817356775, 102280151421, 390937467653, 1497207322929, 5744387279809, 22076468761620, 84973577874915, 327534518354217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

f[n_] := Floor[(1+4^n)/(1+2 n)]

Table[f[n], {n, 1, 40}]     (* A191637 *)

PROG

(MAGMA) [Floor((1+4^n)/(1+2*n)): n in [1..30] ]; // Vincenzo Librandi, Sep 10 2011

(Maxima) A191637(n):=floor((1+4^n)/(1+2*n))$ makelist(A191637(n), n, 1, 30); /* Martin Ettl, Oct 25 2012 */

CROSSREFS

Cf. A191636.

Sequence in context: A243156 A228449 A131203 * A238978 A081914 A120985

Adjacent sequences:  A191634 A191635 A191636 * A191638 A191639 A191640

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jun 09 2011

STATUS

approved

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Last modified January 24 16:41 EST 2020. Contains 331208 sequences. (Running on oeis4.)