Second column (m=2) of triangle A144881 (S1hat(3)).

A144883

Second column (m=2) of triangle A144881 (S1hat(3)).

Terms

    a(0) =1a(1) =3a(2) =21a(3) =96a(4) =684a(5) =4320a(6) =35640a(7) =293760a(8) =2881440a(9) =29695680a(10) =345643200a(11) =4296499200a(12) =58518028800a(13) =851751936000

External references