a(n) = floor(cotangent(n)^3).

Terms

a(0) =0a(1) =-1a(2) =-346a(3) =0a(4) =-1a(5) =-41a(6) =1a(7) =-1a(8) =-11a(9) =3a(10) =-1a(11) =-4a(12) =10a(13) =0a(14) =-2a(15) =36a(16) =0a(17) =-1a(18) =287a(19) =0a(20) =-1a(21) =1441871a(22) =0a(23) =-1a(24) =-421a(25) =0a(26) =-1a(27) =-45a(28) =1a(29) =-1