a(n) is the least k>=1 such that k*(k+1) is divisible by A003418(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =15a(5) =15a(6) =20a(7) =104a(8) =224a(9) =224a(10) =440a(11) =440a(12) =2079a(13) =2079a(14) =2079a(15) =2079a(16) =194480a(17) =194480a(18) =1956240a(19) =1956240a(20) =1956240a(21) =1956240a(22) =6113744a(23) =6113744a(24) =19706400a(25) =19706400a(26) =317839599a(27) =317839599a(28) =2183843375a(29) =2183843375