Number of stochastic matrices of integers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =7a(5) =32a(6) =184a(7) =1268a(8) =10186a(9) =93356a(10) =960646a(11) =10959452a(12) =137221954a(13) =1870087808a(14) =27548231008a(15) =436081302248