Square array, read by antidiagonals, used to recursively calculate the zigzag numbers A000111.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =5a(7) =5a(8) =3a(9) =1a(10) =16a(11) =16a(12) =10a(13) =4a(14) =1a(15) =61a(16) =61a(17) =39a(18) =17a(19) =5a(20) =1a(21) =272a(22) =272a(23) =176a(24) =80a(25) =26a(26) =6a(27) =1a(28) =1385a(29) =1385