OFFSET
1,2
LINKS
Alois P. Heinz, Rows n = 1..141, flattened
Wikipedia, Partition of a set
EXAMPLE
T(3,2) = 6 because the number of entries in the second last blocks of all set partitions of [3] (123, 12|3, 13|2, 1|23, 1|2|3) is 0+2+2+1+1 = 6.
Triangle T(n,k) begins:
1;
3, 1;
8, 6, 1;
24, 25, 10, 1;
83, 98, 63, 15, 1;
324, 399, 338, 135, 21, 1;
1400, 1746, 1727, 980, 257, 28, 1;
6609, 8271, 8874, 6426, 2455, 448, 36, 1;
...
CROSSREFS
Row sums give A070071.
KEYWORD
nonn,tabl
AUTHOR
Alois P. Heinz, May 08 2017
STATUS
approved