Convolution of the sequence of derangement numbers A000166 with itself.

A272988

Convolution of the sequence of derangement numbers A000166 with itself.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =4a(4) =19a(5) =92a(6) =552a(7) =3832a(8) =30453a(9) =272552a(10) =2713710a(11) =29752156a(12) =356133959a(13) =4620985700a(14) =64600445812a(15) =967927029168

External references