A132473 Column 1 of triangle A132471.

1, 2, 4, 30, 384, 7300, 186620, 6046600, 239321824, 11283624600, 622168133880, 39555748796080, 2867144894306352, 234743115413228864, 21539307881356682144, 2200021023571489017104, 248656258771528223642624

Offset

0,2

Comments

Diagonal m of triangle T=A132471 equals diagonal m-1 of matrix power T^m for m>1: T(n,k) = [T^(n-k)](n-1,k) for n>=k>0, with T(n,n)=1 and T(n+1,n)=n+1 for n>=0.

Links

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

Crossrefs

Cf. A132471 (triangle); other columns: A132472, A132474.

Sequence in context: A241540 A349265 A208097 * A053037 A018294 A334488

Adjacent sequences: A132470 A132471 A132472 * A132474 A132475 A132476

Keyword

nonn

Author

Paul D. Hanna, Aug 22 2007

Status

approved