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A167550
The a(n,n+1) diagonal of the ED1 array A167546
1
1, 7, 62, 762, 12264, 245640, 5897520, 165145680, 5284782720, 190253266560, 7610141548800, 334846347897600, 16072626136089600, 835776577757721600, 46803488615967283200, 2808209320881060096000, 179725396599156215808000
OFFSET
1,2
FORMULA
a(n,n+1) = 4*(n-1)*a(n-1,n)+3*(n-1)! with a(1,2) = 1.
CROSSREFS
Equals the a(n, n+1) diagonal of the ED1 array A167546.
Sequence in context: A060005 A055066 A216534 * A304895 A161201 A007291
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Nov 10 2009
STATUS
approved