A(n, k) = 4^n*Pochhammer(k/4, n). Square array read by ascending antidiagonals.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =5a(8) =2a(9) =1a(10) =0a(11) =45a(12) =12a(13) =3a(14) =1a(15) =0a(16) =585a(17) =120a(18) =21a(19) =4a(20) =1a(21) =0a(22) =9945a(23) =1680a(24) =231a(25) =32a(26) =5a(27) =1a(28) =0a(29) =208845