Column 1 of triangle A370040.

Terms

a(0) =1a(1) =0a(2) =9a(3) =-6a(4) =54a(5) =-54a(6) =264a(7) =-324a(8) =1127a(9) =-1534a(10) =4338a(11) =-6274a(12) =15372a(13) =-22986a(14) =50846a(15) =-77448a(16) =158599a(17) =-243696a(18) =470206a(19) =-724576a(20) =1333275a(21) =-2052498a(22) =3634077a(23) =-5575498a(24) =9561408a(25) =-14596950a(26) =24368133a(27) =-36983308a(28) =60336459a(29) =-90983536