Second column of triangle A134134 (S2'(2) = S1hat(2)).

A144895

Second column of triangle A134134 (S2'(2) = S1hat(2)).

Terms

    a(0) =1a(1) =2a(2) =10a(3) =36a(4) =204a(5) =1104a(6) =7776a(7) =57600a(8) =505440a(9) =4803840a(10) =51442560a(11) =597784320a(12) =7609593600a(13) =104364288000

External references