a(n) = A000203(n)^2 - A001157(n) = sigma(n)^2 - sigma_2(n).

Terms

a(0) =0a(1) =4a(2) =6a(3) =28a(4) =10a(5) =94a(6) =14a(7) =140a(8) =78a(9) =194a(10) =22a(11) =574a(12) =26a(13) =326a(14) =316a(15) =620a(16) =34a(17) =1066a(18) =38a(19) =1218a(20) =524a(21) =686a(22) =46a(23) =2750a(24) =310a(25) =914a(26) =780a(27) =2086a(28) =58a(29) =3884