Pascal-(1,3,1) array.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =1a(11) =13a(12) =33a(13) =13a(14) =1a(15) =1a(16) =17a(17) =73a(18) =73a(19) =17a(20) =1a(21) =1a(22) =21a(23) =129a(24) =245a(25) =129a(26) =21a(27) =1a(28) =1a(29) =25