Floor(n*exp(tan n)).

Terms

a(0) =4a(1) =0a(2) =2a(3) =12a(4) =0a(5) =4a(6) =16a(7) =0a(8) =5a(9) =19a(10) =0a(11) =6a(12) =20a(13) =19607a(14) =6a(15) =21a(16) =559a(17) =5a(18) =22a(19) =187a(20) =4a(21) =22a(22) =112a(23) =2a(24) =21a(25) =84a(26) =1a(27) =21a(28) =70a(29) =0