a(n) = A005117(A390138(n) + 1).

Terms

a(0) =3a(1) =17a(2) =74a(3) =174a(4) =417a(5) =583a(6) =1303a(7) =1686a(8) =2479a(9) =3739a(10) =4449a(11) =7157a(12) =8699a(13) =9921a(14) =12193a(15) =14993a(16) =20771a(17) =20849a(18) =28265a(19) =32530a(20) =40449a(21) =42421a(22) =45539a(23) =47217a(24) =62086a(25) =62893a(26) =67997a(27) =70654a(28) =85886a(29) =90842