Odd elements in Pascal's triangle that are not 1.

Terms

a(0) =3a(1) =3a(2) =5a(3) =5a(4) =15a(5) =15a(6) =7a(7) =21a(8) =35a(9) =35a(10) =21a(11) =7a(12) =9a(13) =9a(14) =45a(15) =45a(16) =11a(17) =55a(18) =165a(19) =165a(20) =55a(21) =11a(22) =495a(23) =495a(24) =13a(25) =715a(26) =1287a(27) =1287a(28) =715a(29) =13