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A221944 Floor(sqrt(2*3^n)). 1
1, 2, 4, 7, 12, 22, 38, 66, 114, 198, 343, 595, 1030, 1785, 3092, 5357, 9278, 16071, 27835, 48213, 83507, 144639, 250523, 433919, 751571, 1301759, 2254713, 3905277, 6764139, 11715833, 20292418, 35147500, 60877256, 105442501, 182631769, 316327504, 547895309, 948982513, 1643685929, 2846947541, 4931057788 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

MATHEMATICA

Floor[Sqrt[2 3^Range[0, 40]]] (* Harvey P. Dale, Mar 09 2014 *)

PROG

(PARI) a(n)=sqrtint(2*3^n) \\ Charles R Greathouse IV, Apr 18 2013

(MAGMA) [Floor(Sqrt(2*3^n)): n in [0..40]]; // Vincenzo Librandi, Mar 11 2014

CROSSREFS

Cf. A017910, A017913, A017919, A114183, A221718, A221942-A221946.

Sequence in context: A089259 A309733 A289107 * A257932 A287439 A026713

Adjacent sequences:  A221941 A221942 A221943 * A221945 A221946 A221947

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 01 2013

STATUS

approved

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Last modified July 12 13:15 EDT 2020. Contains 335661 sequences. (Running on oeis4.)