Triangle of values of 2-d recurrence.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =4a(7) =5a(8) =2a(9) =1a(10) =9a(11) =11a(12) =5a(13) =2a(14) =1a(15) =20a(16) =25a(17) =12a(18) =5a(19) =2a(20) =1a(21) =45a(22) =57a(23) =27a(24) =12a(25) =5a(26) =2a(27) =1a(28) =102a(29) =129