a(n) = 1 + Sum_{d|n, d > 1} d^2*a(n/d).

Terms

a(0) =1a(1) =5a(2) =10a(3) =37a(4) =26a(5) =122a(6) =50a(7) =293a(8) =172a(9) =330a(10) =122a(11) =1306a(12) =170a(13) =642a(14) =710a(15) =2341a(16) =290a(17) =2876a(18) =362a(19) =3562a(20) =1382a(21) =1578a(22) =530a(23) =13082a(24) =1276a(25) =2202a(26) =3088a(27) =6946a(28) =842a(29) =12822