Array a(n,m) read by antidiagonals where a(0,m)=a(1,m)=1 and a(n,m) = m*a(n-1,m)-a(n-2,m) for n>=2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =-1a(6) =1a(7) =1a(8) =0a(9) =-1a(10) =1a(11) =1a(12) =1a(13) =-1a(14) =1a(15) =1a(16) =1a(17) =2a(18) =1a(19) =-1a(20) =1a(21) =1a(22) =1a(23) =3a(24) =5a(25) =1a(26) =0a(27) =-1a(28) =1a(29) =1