A180589 a(n)=floor(n!*h(n)/n), where h(n)=sum(1/k,k=1..10)

1, 1, 3, 12, 54, 294, 1866, 13698, 114064, 1062864, 10958530, 123870240, 1523289156, 20247546240, 289277533440, 4420892649600, 71965034739952, 1243166003251200, 22713955095665178, 437647401838080000

Offset

1,3

Links

Table of n, a(n) for n=1..20.

Formula

a(n)= ( A000254(n) - A061006(n) )/n

Maple

h:= n->sum(1/k, k=1..n):seq(floor(n!*h(n)/n), n=1..25);

Crossrefs

A000254 A061006

Sequence in context: A266083 A245374 A052673 * A370937 A042971 A256142

Adjacent sequences: A180586 A180587 A180588 * A180590 A180591 A180592

Keyword

nonn

Author

Gary Detlefs, Sep 10 2010

Status

approved