Square array, read by antidiagonals, used to recursively calculate the Springer numbers A001586.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =1a(6) =11a(7) =11a(8) =5a(9) =1a(10) =57a(11) =57a(12) =27a(13) =7a(14) =1a(15) =361a(16) =361a(17) =175a(18) =51a(19) =9a(20) =1a(21) =2763a(22) =2763a(23) =1353a(24) =413a(25) =83a(26) =11a(27) =1a(28) =24611a(29) =24611