a(n) = det M_n where M_n is the n X n matrix m(i,j) = A000041(i+j).

Terms

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