Dispersion of A016813 (4k+1, k>1), by antidiagonals.

Terms

a(0) =1a(1) =5a(2) =2a(3) =21a(4) =9a(5) =3a(6) =85a(7) =37a(8) =13a(9) =4a(10) =341a(11) =149a(12) =53a(13) =17a(14) =6a(15) =1365a(16) =597a(17) =213a(18) =69a(19) =25a(20) =7a(21) =5461a(22) =2389a(23) =853a(24) =277a(25) =101a(26) =29a(27) =8a(28) =21845a(29) =9557