A075184 One half of fourth column of triangle A075181.

3, 50, 675, 8820, 117600, 1632960, 23814000, 365904000, 5927644800, 101189088000, 1818030614400, 34326452160000, 679990671360000, 14108934647808000, 306113492805120000, 6933770723303424000

Offset: 0

Author

Wolfdieter Lang, Sep 19 2002

Keywords

• nonn
• easy

Comments

Also one half of fourth diagonal of unsigned triangle A048594.

Crossrefs

Cf. A008275, A048594, A075181.

Formula

a(n) = A075181(n+4, 3)/2 = |A048594(n+4, n+1)|/2, n>=0.

a(n) = -(n+1)!*S1(n+4, n+1)/2 with S1(n, m) := A008275(n, m) (Stirling1).