Antidiagonal sums of square array A137634.

Terms

a(0) =1a(1) =3a(2) =15a(3) =72a(4) =361a(5) =1840a(6) =9505a(7) =49578a(8) =260540a(9) =1377328a(10) =7316373a(11) =39020372a(12) =208809544a(13) =1120621368a(14) =6029023185a(15) =32507001876a(16) =175604614108a(17) =950233307930