A075183 One half of third column of triangle A075181.

1, 11, 105, 1020, 10500, 115920, 1375920, 17539200, 239500800, 3492720000, 54226972800, 893577484800, 15583119552000, 286816578048000, 5557616064000000, 113108602134528000, 2412627824775168000

Offset

0,2

Comments

Also one half of third diagonal of triangle A048594.

Links

Table of n, a(n) for n=0..16.

Formula

a(n) = A075181(n+3, 2)/2 = A048594(n+3, n+1)/2, n>=0.

a(n) = (n+1)!*S1(n+3, n+1)/2 with S1(n, m) := A008275(n, m) (Stirling1).

Crossrefs

Cf. A008275, A048594, A075181.

Sequence in context: A377641 A099839 A287834 * A302925 A250416 A116011

Adjacent sequences: A075180 A075181 A075182 * A075184 A075185 A075186

Keyword

nonn,easy

Author

Wolfdieter Lang, Sep 19 2002

Status

approved