Triangle read by rows: A080779 with rows reversed.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =1a(6) =6a(7) =12a(8) =6a(9) =0a(10) =24a(11) =60a(12) =40a(13) =0a(14) =-4a(15) =120a(16) =360a(17) =300a(18) =0a(19) =-60a(20) =0a(21) =720a(22) =2520a(23) =2520a(24) =0a(25) =-840a(26) =0a(27) =120a(28) =5040a(29) =20160