Main diagonal of triangle A084029.

Terms

a(0) =1a(1) =0a(2) =120a(3) =2020a(4) =10400a(5) =100140a(6) =1001203a(7) =10001312a(8) =100000080a(9) =1000000900a(10) =10000010108a(11) =100000000524