Floor(n*exp(cot n)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =9a(4) =3a(5) =0a(6) =22a(7) =6a(8) =0a(9) =46a(10) =10a(11) =2a(12) =112a(13) =16a(14) =4a(15) =445a(16) =22a(17) =7a(18) =13921a(19) =31a(20) =10a(22) =43a(23) =15a(24) =0a(25) =60a(26) =19a(27) =0a(28) =89a(29) =25a(30) =3