Triangle of binomial coefficients C(-n,k).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =-2a(5) =3a(6) =1a(7) =-3a(8) =6a(9) =-10a(10) =1a(11) =-4a(12) =10a(13) =-20a(14) =35a(15) =1a(16) =-5a(17) =15a(18) =-35a(19) =70a(20) =-126a(21) =1a(22) =-6a(23) =21a(24) =-56a(25) =126a(26) =-252a(27) =462a(28) =1a(29) =-7