A convolution triangle of numbers, generalizing Pascal's triangle A007318.

Terms

a(0) =1a(1) =3a(2) =1a(3) =10a(4) =6a(5) =1a(6) =35a(7) =29a(8) =9a(9) =1a(10) =126a(11) =130a(12) =57a(13) =12a(14) =1a(15) =462a(16) =562a(17) =312a(18) =94a(19) =15a(20) =1a(21) =1716a(22) =2380a(23) =1578a(24) =608a(25) =140a(26) =18a(27) =1a(28) =6435a(29) =9949