Odd numbers to the left of the central elements of the (2,1)-Pascal triangle A029653.

Terms

a(0) =5a(1) =7a(2) =9a(3) =11a(4) =25a(5) =13a(6) =55a(7) =15a(8) =49a(9) =91a(10) =17a(11) =19a(12) =81a(13) =21a(14) =285a(15) =23a(16) =121a(17) =385a(18) =825a(19) =25a(20) =2079a(21) =27a(22) =169a(23) =3289a(24) =4719a(25) =29a(26) =819a(27) =5005a(28) =9867a(29) =31