A064033 Product of non-unitary divisors of central binomial coefficients or a(n)=1 if all divisors are unitary. See A046098.

1, 1, 1, 1, 1, 20, 1, 1, 15876, 1016255020032, 1, 728933458176, 8670998958336, 19247673071478783248355557376, 1714723915100625, 752711194884611945703392100000000, 1

Offset

1,6

Links

Table of n, a(n) for n=1..17.

Formula

a(n)=A061538[A001405(n)]

Crossrefs

Cf. A001405, A061537, A061538, A048243, A056173.

Sequence in context: A257608 A022183 A015146 * A040409 A040408 A040407

Adjacent sequences: A064030 A064031 A064032 * A064034 A064035 A064036

Keyword

nonn

Author

Labos Elemer, Sep 13 2001

Status

approved