Ceiling(n*exp(cot n)).

Terms

a(0) =2a(1) =2a(2) =1a(3) =10a(4) =4a(5) =1a(6) =23a(7) =7a(8) =1a(9) =47a(10) =11a(11) =3a(12) =113a(13) =17a(14) =5a(15) =446a(16) =23a(17) =8a(18) =13922a(19) =32a(20) =11a(22) =44a(23) =16a(24) =1a(25) =61a(26) =20a(27) =1a(28) =90a(29) =26a(30) =4