a(n) = Sum_{i+j=n, i,j >= 1} tau(i)*sigma(j), where tau() = A000005(), sigma() = A000203().

Terms

a(0) =0a(1) =1a(2) =5a(3) =12a(4) =24a(5) =39a(6) =60a(7) =87a(8) =113a(9) =158a(10) =189a(11) =249a(12) =286a(13) =372a(14) =402a(15) =516a(16) =545a(17) =696a(18) =709a(19) =886a(20) =912a(21) =1125a(22) =1110a(23) =1401a(24) =1348a(25) =1674a(26) =1654a(27) =1992a(28) =1906a(29) =2390