A116472 a(n) = floor(exp(2*n)).

1, 7, 54, 403, 2980, 22026, 162754, 1202604, 8886110, 65659969, 485165195, 3584912846, 26489122129, 195729609428, 1446257064291, 10686474581524, 78962960182680, 583461742527454, 4311231547115195, 31855931757113756, 235385266837019985, 1739274941520501047

Offset

0,2

Comments

A bisection of A000149, which is the main entry for this sequence.

a(n) = A000149(2*n).

Links

Georg Fischer, Table of n, a(n) for n = 0..100 (first 36 terms from Vincenzo Librandi)

Mathematica

Floor[Exp[2Range[0, 30]]] (* Harvey P. Dale, Aug 22 2011 *)

Prog

(Magma) [Floor(Exp(2*n)): n in [0..25]]; // Vincenzo Librandi, Aug 23 2011
(PARI) a(n)=exp(2*n)\1 \\ Charles R Greathouse IV, Aug 23 2011
(Haskell)
a116472 = a000149 . (* 2)  -- Reinhard Zumkeller, Mar 17 2015

Crossrefs

Cf. A000149.

Sequence in context: A203289 A204258 A081008 * A015562 A243670 A152108

Adjacent sequences: A116469 A116470 A116471 * A116473 A116474 A116475

Keyword

nonn

Author

Milton L. Brown (miltbrown(AT)earthlink.net), Jan 20 2008

Extensions

More terms from Harvey P. Dale, Aug 22 2011

Status

approved