A382658 Number of forknesses on n elements.
1, 2, 6, 56, 15026, 1746994454, 1235642810043131384, 40822119528659637193235146998172, 374299843632760183014518932671883409448485124695664, 7237131063359733682672812567239149471890797777405500679038631641915376539420
Offset: 0
Keywords
Examples
For n=2 the a(2)=6 forknesses are {}, {111}, {222}, {111, 222}, {111, 112, 122, 211, 221, 222}, and {111, 112, 121, 122, 211, 212, 221, 222}.
Links
- T. Boege, Counting combinatorial objects using SAT solvers.
- V. Chvátal, F. Matúš, and Y. Zwólš, Patterns of conjunctive forks, arXiv:1608.03949 [math.PR], 2016.
- F. Matúš, On patterns of conditional independences and covariance signs among binary variables, Acta Math. Hungar. 154, 511-524 (2018).
Programs
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Perl
# see Boege link.
Comments