Self-convolution of A023532.

Terms

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