a(n) = floor( tan(n)^2 ).

Terms

a(0) =0a(1) =2a(2) =4a(3) =0a(4) =1a(5) =11a(6) =0a(7) =0a(8) =46a(9) =0a(10) =0a(11) =51053a(12) =0a(13) =0a(14) =52a(15) =0a(16) =0a(17) =12a(18) =1a(19) =0a(20) =5a(21) =2a(22) =0a(23) =2a(24) =4a(25) =0a(26) =1a(27) =10a(28) =0a(29) =0