Odd elements in 4-Pascal triangle A028275 (by row).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =5a(8) =1a(9) =1a(10) =1a(11) =1a(12) =7a(13) =7a(14) =1a(15) =1a(16) =23a(17) =23a(18) =1a(19) =1a(20) =9a(21) =31a(22) =55a(23) =55a(24) =31a(25) =9a(26) =1a(27) =1a(28) =1a(29) =1