Odd numbers to the left of the central elements of the (1,2)-Pascal triangle A029635.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =7a(8) =1a(9) =27a(10) =1a(11) =9a(12) =35a(13) =77a(14) =1a(15) =1a(16) =11a(17) =1a(18) =65a(19) =1a(20) =13a(21) =77a(22) =275a(23) =1a(24) =935a(25) =1a(26) =15a(27) =1287a(28) =2717a(29) =1