Erroneous version of A094047.

A260321

Erroneous version of A094047.

Terms

    a(0) =-1a(1) =0a(2) =2a(3) =12a(4) =312a(5) =9600a(6) =410800a(7) =23879520a(8) =1749363840a(9) =159591720960

External references