Convolution of A006352 and A010815.

Terms

a(0) =1a(1) =-25a(2) =-49a(3) =0a(4) =0a(5) =121a(6) =0a(7) =169a(8) =0a(9) =0a(10) =0a(11) =0a(12) =-289a(13) =0a(14) =0a(15) =-361a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =0a(22) =529a(23) =0a(24) =0a(25) =0a(26) =625a(27) =0a(28) =0a(29) =0