Sum of numbers in n-th row of A070861.

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =60a(5) =360a(6) =2268a(7) =18144a(8) =152544a(9) =1471008a(10) =14963328a(11) =179559936a(12) =2156963328a(13) =30197486592a(14) =426680825088