A092608 Number of connected ordered 5-element T_0-antichains on an unlabeled n-set.
0, 0, 0, 0, 30, 1945, 41901, 410505, 2363160, 9266220, 27058460, 62261590, 117178540, 185037520, 249548910, 290969170, 295695540, 263173865, 205581235, 140943485, 84636895, 44347105, 20159615, 7888705, 2629575, 736281, 169911, 31465, 4495, 465, 31, 1
Offset: 0
Links
- Goran Kilibarda and Vladeta Jovovic, Enumeration of some classes of T_0-hypergraphs, arXiv:1411.4187 [math.CO], 2014.
Formula
O.g.f.: 5!*A(log(1+x)), where A(x) is e.g.f. for A094036.