Diagonal sums of Riordan array A154948.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =18a(6) =34a(7) =62a(8) =115a(9) =211a(10) =389a(11) =715a(12) =1316a(13) =2420a(14) =4452a(15) =8188a(16) =15061a(17) =27701a(18) =50951a(19) =93713a(20) =172366a(21) =317030a(22) =583110a(23) =1072506a(24) =1972647a(25) =3628263a(26) =6673417a(27) =12274327a(28) =22576008a(29) =41523752