a(n) = (Sum_{k=1..A047380(n)} k^6) / (Sum_{k=1..A047380(n)} k^2).

Terms

a(0) =1a(1) =13a(2) =163a(3) =373a(4) =2191a(5) =3433a(6) =7411a(7) =10363a(8) =24583a(9) =31591a(10) =49981a(11) =61723a(12) =109513a(13) =130351a(14) =180793a(15) =210901a(16) =324013a(17) =370273a(18) =477463a(19) =539041a(20) =759811a(21) =846613a(22) =1042303a(23) =1151983a(24) =1533331a(25) =1679323a(26) =2002321a(27) =2180263a(28) =2785693a(29) =3013051