a(n) = A347961(A276086(n)), where A347961 is Dirichlet convolution of A342001 with itself.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =1a(5) =14a(6) =0a(7) =2a(8) =2a(9) =40a(10) =20a(11) =210a(12) =1a(13) =18a(14) =20a(15) =234a(16) =120a(17) =1040a(18) =4a(19) =52a(20) =60a(21) =576a(22) =300a(23) =2340a(24) =10a(25) =108a(26) =128a(27) =1090a(28) =575a(29) =4170