Inverse of A111526. Row sums have general term C(n,floor(n/2))*(cos(Pi*n/2) + sin(Pi*n/2)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =-3a(4) =0a(5) =1a(6) =0a(7) =-4a(8) =0a(9) =1a(10) =10a(11) =0a(12) =-5a(13) =0a(14) =1a(15) =0a(16) =15a(17) =0a(18) =-6a(19) =0a(20) =1a(21) =-35a(22) =0a(23) =21a(24) =0a(25) =-7a(26) =0a(27) =1a(28) =0a(29) =-56