Column 1 of triangle in A331431.

Terms

a(0) =6a(1) =-24a(2) =60a(3) =-120a(4) =210a(5) =-336a(6) =504a(7) =-720a(8) =990a(9) =-1320a(10) =1716a(11) =-2184a(12) =2730a(13) =-3360a(14) =4080a(15) =-4896a(16) =5814a(17) =-6840a(18) =7980a(19) =-9240a(20) =10626a(21) =-12144a(22) =13800a(23) =-15600a(24) =17550a(25) =-19656a(26) =21924a(27) =-24360a(28) =26970a(29) =-29760