a(n) is the numerator of Sum_{d|n} sigma(n/d)^d/d, where sigma is A000203.

Terms

a(0) =1a(1) =7a(2) =13a(3) =47a(4) =31a(5) =175a(6) =57a(7) =479a(8) =310a(9) =847a(10) =133a(11) =4799a(12) =183a(13) =737a(14) =4513a(15) =25023a(16) =307a(17) =32123a(18) =381a(19) =195887a(20) =17803a(21) =356671a(22) =553a(23) =1892351a(24) =39656a(25) =3192287a(26) =807286a(27) =12898415a(28) =871a(29) =6727787