a(n) = floor(n*exp(-tan(n))).

Terms

a(0) =0a(1) =17a(2) =3a(3) =1a(4) =146a(5) =8a(6) =2a(7) =7180a(8) =14a(9) =5a(11) =22a(12) =8a(13) =0a(14) =35a(15) =11a(16) =0a(17) =56a(18) =16a(19) =2a(20) =96a(21) =21a(22) =4a(23) =202a(24) =28a(25) =7