Square number array read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =4a(6) =1a(7) =1a(8) =5a(9) =27a(10) =1a(11) =1a(12) =6a(13) =36a(14) =256a(15) =1a(16) =1a(17) =7a(18) =45a(19) =353a(20) =3125a(21) =1a(22) =1a(23) =8a(24) =54a(25) =452a(26) =4400a(27) =46656a(28) =1a(29) =1