Convolution square of A003106.

Terms

a(0) =1a(1) =0a(2) =2a(3) =2a(4) =3a(5) =4a(6) =7a(7) =8a(8) =13a(9) =16a(10) =23a(11) =28a(12) =40a(13) =48a(14) =66a(15) =82a(16) =107a(17) =132a(18) =171a(19) =208a(20) =266a(21) =324a(22) =406a(23) =494a(24) =614a(25) =740a(26) =912a(27) =1098a(28) =1338a(29) =1604