Sum of the divisors of the n-th odd square: a(n) = sigma((2*n-1)^2).

Terms

a(0) =1a(1) =13a(2) =31a(3) =57a(4) =121a(5) =133a(6) =183a(7) =403a(8) =307a(9) =381a(10) =741a(11) =553a(12) =781a(13) =1093a(14) =871a(15) =993a(16) =1729a(17) =1767a(18) =1407a(19) =2379a(20) =1723a(21) =1893a(22) =3751a(23) =2257a(24) =2801a(25) =3991a(26) =2863a(27) =4123a(28) =4953a(29) =3541