Row 3 in rectangular array A292929.

Terms

a(0) =2a(1) =-4a(2) =8a(3) =-12a(4) =20a(5) =-44a(6) =52a(7) =-76a(8) =136a(9) =-164a(10) =252a(11) =-396a(12) =482a(13) =-684a(14) =990a(15) =-1272a(16) =1748a(17) =-2388a(18) =3038a(19) =-4020a(20) =5358a(21) =-6796a(22) =8820a(23) =-11448a(24) =14334a(25) =-18304a(26) =23320a(27) =-28940a(28) =36444a(29) =-45708