Row sums of signed triangle A056588.

Terms

a(0) =1a(1) =0a(2) =-2a(3) =-6a(4) =-14a(5) =0a(6) =278a(7) =2520a(8) =15016a(9) =0a(10) =-2172632a(11) =-53222400a(12) =-835765304a(13) =0a(14) =851104689248a(17) =0a(21) =0