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A298413
a(n) = a(floor(n/2))*a(ceiling(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.
1
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
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
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Feb 11 2018
STATUS
approved