A319761 a(n) = Product_{i=1..n} i^s(n,i), where s is an unsigned Stirling number of the 1st kind.

1, 1, 2, 24, 5971968, 295334114577121602242226794587320483840

Offset

0,3

Links

Table of n, a(n) for n=0..5.

Example

For n = 4 we have a(4) = 1^6*2^11*3^6*4^1 = 5971968.

Maple

f:= n -> mul(i^abs(Stirling1(n, i)), i=1..n):
map(f, [$0..6]); # Robert Israel, Sep 27 2018

Prog

(PARI) a(n) = prod(i=1, n, i^abs(stirling(n, i, 1))); \\ Michel Marcus, Sep 27 2018

Crossrefs

Cf. A132393.

Sequence in context: A365617 A159932 A100010 * A045510 A226325 A065665

Adjacent sequences: A319758 A319759 A319760 * A319762 A319763 A319764

Keyword

nonn

Author

Jeffrey Shallit, Sep 27 2018

Status

approved