Ceiling(n*exp(-sec(n))).

Terms

a(0) =1a(1) =23a(2) =9a(3) =19a(4) =1a(5) =3a(6) =2a(7) =7726a(8) =27a(9) =33a(10) =1a(11) =4a(12) =5a(13) =1a(14) =56a(15) =46a(16) =644a(17) =4a(18) =7a(19) =2a(20) =131a(21) =60a(22) =151a(23) =3a(24) =10a(25) =6a(26) =828a(27) =80a(28) =111a(29) =1