Number of nonisomorphic unordered triples of derangements of an n-set.

A362761

Number of nonisomorphic unordered triples of derangements of an n-set.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =18a(5) =138a(6) =4642a(7) =211600a(8) =13511246a(9) =1092862024a(10) =109276859229

External references