Row sums of a scaled Legendre triangle.

Terms

a(0) =1a(1) =1a(2) =1a(3) =9a(4) =43a(5) =213a(6) =1507a(7) =12537a(8) =114325a(9) =1144221a(10) =12512373a(11) =148351881a(12) =1892798733a(13) =25816700309a(14) =374406371121