OFFSET
0,2
FORMULA
T(n, h) = C(n-1, h)*U(n, h), where U(n, h) is the array in A019538.
EXAMPLE
First rows:
1
2 6
3 42 36
4 180 600 240
To see that T(4,2)=42, first count 7 functions from {1,2,3,4}
onto {1,2} with f(1)=1 and 7 with f(1)=2. Count 14 onto {1,3}
and 14 onto {2,3}, for a total of 42.
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Dec 17 2004
STATUS
approved