Fourth column (m=3) of triangle A128494.

Terms

a(0) =1a(1) =1a(2) =-3a(3) =-3a(4) =7a(5) =7a(6) =-13a(7) =-13a(8) =22a(9) =22a(10) =-34a(11) =-34a(12) =50a(13) =50a(14) =-70a(15) =-70a(16) =95a(17) =95a(18) =-125a(19) =-125a(20) =161a(21) =161a(22) =-203a(23) =-203a(24) =252a(25) =252a(26) =-308a(27) =-308a(28) =372a(29) =372