Diagonal sums of A110135 when read as a number triangle.

Terms

a(0) =1a(1) =2a(2) =7a(3) =22a(4) =79a(5) =286a(6) =1071a(7) =4070a(8) =15721a(9) =61506a(10) =243703a(11) =977366a(12) =3968169a(13) =16313842a(14) =67942539a(15) =286769518a(16) =1227194947a(17) =5326324598a(18) =23451408843a(19) =104753097326a(20) =474663076539