Expansion of (1 - 2*x^2)/(1 + x)^4. Third column of Riordan triangle A248156.

Terms

a(0) =1a(1) =-4a(2) =8a(3) =-12a(4) =15a(5) =-16a(6) =14a(7) =-8a(8) =-3a(9) =20a(10) =-44a(11) =76a(12) =-117a(13) =168a(14) =-230a(15) =304a(16) =-391a(17) =492a(18) =-608a(19) =740a(20) =-889a(21) =1056a(22) =-1242a(23) =1448a(24) =-1675a(25) =1924a(26) =-2196a(27) =2492a(28) =-2813a(29) =3160