Numbers k such that neither 4 nor 9 divides binomial(2k-1,k) (almost certainly finite).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =9a(6) =10a(7) =12a(8) =18a(9) =33a(10) =34a(11) =36a(12) =40a(13) =64a(14) =66a(15) =192a(16) =256a(17) =264a(18) =272a(19) =513a(20) =514a(21) =516a(22) =576a(23) =768a(24) =1026a(25) =1056a(26) =2304a(27) =16392a(28) =65664a(29) =81920