Odd elements in 3-Pascal triangle A028262 (by row).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =1a(8) =1a(9) =5a(10) =5a(11) =1a(12) =1a(13) =13a(14) =13a(15) =1a(16) =1a(17) =7a(18) =19a(19) =19a(20) =7a(21) =1a(22) =1a(23) =45a(24) =45a(25) =1a(26) =1a(27) =9a(28) =71a(29) =71