Triangle read by rows. Signed version of A008277.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =-3a(5) =1a(6) =-1a(7) =-7a(8) =-6a(9) =1a(10) =-1a(11) =-15a(12) =-25a(13) =-10a(14) =1a(15) =-1a(16) =-31a(17) =-90a(18) =-65a(19) =-15a(20) =1a(21) =-1a(22) =-63a(23) =-301a(24) =-350a(25) =-140a(26) =-21a(27) =1a(28) =-1a(29) =-127