Array, a(n,k) = total size of all n-length words on a k-letter alphabet, read by antidiagonals.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =8a(5) =3a(6) =4a(7) =24a(8) =18a(9) =4a(10) =5a(11) =64a(12) =81a(13) =32a(14) =5a(15) =6a(16) =160a(17) =324a(18) =192a(19) =50a(20) =6a(21) =7a(22) =384a(23) =1215a(24) =1024a(25) =375a(26) =72a(27) =7a(28) =8a(29) =896