Diagonal sums of triangle A155856.

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =35a(5) =168a(6) =967a(7) =6538a(8) =50831a(9) =446919a(10) =4383861a(11) =47451921a(12) =561715093a(13) =7217604520a(14) =100031995789