Record values of sigma(n).

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =12a(5) =15a(6) =18a(7) =28a(8) =31a(9) =39a(10) =42a(11) =60a(12) =72a(13) =91a(14) =96a(15) =124a(16) =168a(17) =195a(18) =224a(19) =234a(20) =252a(21) =280a(22) =360a(23) =403a(24) =480a(25) =546a(26) =576a(27) =600a(28) =744a(29) =819