OFFSET
2,2
COMMENTS
LINKS
Paul D. Hanna, Table of n, a(n) for n = 2..42
EXAMPLE
E.g.f.: A(x) = x^2/2! + 18*x^3/3! + 426*x^4/4! + 12040*x^5/5! + 401355*x^6/6! + 15456756*x^7/7! + 676130644*x^8/8! + 33151425840*x^9/9! + 1802216703285*x^10/10! + ... + a(n)*x^n/n! + ...
a(n) is divisible by n*(n-1)/2, where a(n)*2/(n*(n-1)) begins
[1, 6, 71, 1204, 26757, 736036, 24147523, 920872940, 40049260073, ...].
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 20 2023
STATUS
approved