A094590 a(1) = 1; a(n+1) = a(n) * k(n), where k(n) is the number of elements of {a(j)}, 1<=j<=n, which are <= n.

1, 1, 2, 6, 18, 54, 216, 864, 3456, 13824, 55296, 221184, 884736, 3538944, 14155776, 56623104, 226492416, 905969664, 4529848320, 22649241600, 113246208000, 566231040000, 2831155200000, 14155776000000, 70778880000000

Offset

1,3

Links

Table of n, a(n) for n=1..25.

Crossrefs

Cf. A094589.

Sequence in context: A086680 A275872 A148455 * A004529 A366550 A238236

Adjacent sequences: A094587 A094588 A094589 * A094591 A094592 A094593

Keyword

nonn,easy

Author

Leroy Quet, Jun 07 2004

Extensions

More terms from Vladeta Jovovic, Jun 13 2004

Status

approved