A005182 a(n) = floor(e^((n-1)/2)).

0, 1, 1, 2, 4, 7, 12, 20, 33, 54, 90, 148, 244, 403, 665, 1096, 1808, 2980, 4914, 8103, 13359, 22026, 36315, 59874, 98715, 162754, 268337, 442413, 729416, 1202604, 1982759, 3269017, 5389698, 8886110, 14650719, 24154952, 39824784

Offset: 0

Author

N. J. A. Sloane, R. K. Guy

Keywords

• nonn

References

• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• R. K. Guy and N. J. A. Sloane, Correspondence, 1988.

Programs

Mathematica

Floor[E^((Range[0,40]-1)/2)] (* Harvey P. Dale, Mar 20 2016 *)