OFFSET
1,4
LINKS
Don Knuth, Rows n = 1..16, flattened
EXAMPLE
For example, the entries for n=3 are {4,2,2}, because the empty subgraph and the subgraphs with a single arc have 1 weak component {123}; 1->2,1->3 and 1->3,2->3 have 2 weak components (namely {1,23} and {12,3}); finally 1->2,2->3 and 1->2,1->3,2->3 have 3 weak components (namely {1,2,3}).
Triangle T(n,k) begins:
1;
1, 1;
4, 2, 2;
31, 15, 10, 8;
474, 228, 162, 96, 64;
14357, 7057, 5242, 3296, 1792, 1024;
865024, 438662, 342394, 222720, 130048, 65536, 32768;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Don Knuth, Jan 16 2022
STATUS
approved