Expansion of (1 - 2*x^2)/(1 + x)^3. Second column of Riordan triangle A248156.

Terms

a(0) =1a(1) =-3a(2) =4a(3) =-4a(4) =3a(5) =-1a(6) =-2a(7) =6a(8) =-11a(9) =17a(10) =-24a(11) =32a(12) =-41a(13) =51a(14) =-62a(15) =74a(16) =-87a(17) =101a(18) =-116a(19) =132a(20) =-149a(21) =167a(22) =-186a(23) =206a(24) =-227a(25) =249a(26) =-272a(27) =296a(28) =-321a(29) =347