A298413 a(n) = a(floor(n/2))*a(ceiling(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.

1, 2, 3, 6, 9, 18, 36, 54, 81, 162, 324, 648, 1296, 1944, 2916, 4374, 6561, 13122, 26244, 52488, 104976, 209952, 419904, 839808, 1679616, 2519424, 3779136, 5668704, 8503056, 12754584, 19131876, 28697814, 43046721, 86093442, 172186884, 344373768, 688747536

Offset

0,2

Links

Clark Kimberling, Table of n, a(n) for n = 0..1000

Mathematica

a[0] = 1; a[1] = 2; a[2] = 3;
a[n_] := a[n] = a[Floor[n/2]]*a[Ceiling[n/2]];
t = Table[a[n], {n, 0, 30}]  (* A298413 *)

Crossrefs

Cf. A298338.

Sequence in context: A113863 A085431 A108862 * A268610 A018582 A018619

Adjacent sequences: A298410 A298411 A298412 * A298414 A298415 A298416

Keyword

nonn,easy

Author

Clark Kimberling, Feb 11 2018

Status

approved