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A089500
Denominators for computation of column sequences of triangle A071951 (Legendre-Stirling).
9
1, 2, 10, 630, 2520, 277200, 97297200, 3405402000, 463134672000, 475176173472000, 16631166071520000, 4207685016094560000, 3786916514485104000000, 98459829376612704000000
OFFSET
1,2
COMMENTS
The k-th column sequence A071951(n+k,k), n>=0, is sum(A089278(k,p)*(p*(p+1))^n,p=1..k)/a(k), k>=1.
FORMULA
a(n)= N(n)/D(n) with N(n) := sfac(n-1)*sfac(2*n+1)/sfac(n+1)= A089501(n) and D(n) := gcd([seq((2*m+1)*((m*(m+1))^n)*N(n)/((n+m+1)!*(n-m)!), m=1..n)]), where sfac(n)=A000178(n) (superfactorials) and gcd(L) is the greatest common divisor >1 of a list of numbers L.
CROSSREFS
Sequence in context: A087754 A128295 A375532 * A246628 A028582 A222420
KEYWORD
nonn
AUTHOR
Wolfdieter Lang, Nov 07 2003
STATUS
approved