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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
OFFSET
1,2
LINKS
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: A228449 A368288 A131203 * A345241 A238978 A081914
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 09 2011
STATUS
approved