Ramanujan's tau function (or Ramanujan numbers, or tau numbers).

Terms

a(0) =1a(1) =-24a(2) =252a(3) =-1472a(4) =4830a(5) =-6048a(6) =-16744a(7) =84480a(8) =-113643a(9) =-115920a(10) =534612a(11) =-370944a(12) =-577738a(13) =401856a(14) =1217160a(15) =987136a(16) =-6905934a(17) =2727432a(18) =10661420a(19) =-7109760a(20) =-4219488a(21) =-12830688a(22) =18643272a(23) =21288960a(24) =-25499225a(25) =13865712a(26) =-73279080a(27) =24647168