Row 2 in rectangular array A292929.

Terms

a(0) =2a(1) =-4a(2) =8a(3) =-14a(4) =18a(5) =-36a(6) =56a(7) =-74a(8) =116a(9) =-164a(10) =224a(11) =-324a(12) =442a(13) =-592a(14) =808a(15) =-1074a(16) =1410a(17) =-1860a(18) =2416a(19) =-3102a(20) =4010a(21) =-5112a(22) =6464a(23) =-8204a(24) =10294a(25) =-12860a(26) =16072a(27) =-19914a(28) =24586a(29) =-30356