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

Terms

a(0) =1a(1) =3a(2) =1a(3) =3a(4) =6a(5) =1a(6) =0a(7) =15a(8) =9a(9) =1a(10) =0a(11) =18a(12) =36a(13) =12a(14) =1a(15) =0a(16) =9a(17) =81a(18) =66a(19) =15a(20) =1a(21) =0a(22) =0a(23) =108a(24) =216a(25) =105a(26) =18a(27) =1a(28) =0a(29) =0