Array T(n,k) read by antidiagonals: the k-th term of the n-th difference of A131531.

Terms

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