a(n) = 16 times the sum of the cubes of the divisors of 2*n+1.

Terms

a(0) =16a(1) =448a(2) =2016a(3) =5504a(4) =12112a(5) =21312a(6) =35168a(7) =56448a(8) =78624a(9) =109760a(10) =154112a(11) =194688a(12) =252016a(13) =327040a(14) =390240a(15) =476672a(16) =596736a(17) =693504a(18) =810464a(19) =984704a(20) =1102752a(21) =1272128a(22) =1526112a(23) =1661184a(24) =1887888a(25) =2201472a(26) =2382048a(27) =2685312a(28) =3073280a(29) =3286080