Square array read by ascending antidiagonals: number of m-shape complementary Bell numbers.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =-1a(5) =0a(6) =1a(7) =-1a(8) =0a(9) =-1a(10) =1a(11) =-1a(12) =2a(13) =1a(14) =1a(15) =1a(16) =-1a(17) =9a(18) =-1a(19) =1a(20) =-1a(21) =1a(22) =-1a(23) =34a(24) =-197a(25) =-43a(26) =-2a(27) =1a(28) =1a(29) =-1