A167550 The a(n,n+1) diagonal of the ED1 array A167546.

1, 7, 62, 762, 12264, 245640, 5897520, 165145680, 5284782720, 190253266560, 7610141548800, 334846347897600, 16072626136089600, 835776577757721600, 46803488615967283200, 2808209320881060096000, 179725396599156215808000

Offset: 1

Author

Johannes W. Meijer, Nov 10 2009

Keywords

• easy
• nonn

Crossrefs

Equals the a(n, n+1) diagonal of the ED1 array A167546.

Formula

a(n,n+1) = 4*(n-1)*a(n-1,n)+3*(n-1)! with a(1,2) = 1.