Self-convolution of A001190.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =3a(5) =6a(6) =11a(7) =22a(8) =44a(9) =92a(10) =193a(11) =414a(12) =896a(13) =1966a(14) =4347a(15) =9700a(16) =21787a(17) =49262a(18) =111976a(19) =255824a(20) =586996a(21) =765220a(22) =1187129a(23) =2186146a(24) =3966763a(25) =7642844a(26) =14733649a(27) =29037924a(28) =57062745a(29) =113051998