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

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =5a(6) =1a(7) =6a(8) =14a(9) =1a(10) =7a(11) =20a(12) =1a(13) =8a(14) =27a(15) =50a(16) =1a(17) =9a(18) =35a(19) =77a(20) =1a(21) =10a(22) =44a(23) =112a(24) =182a(25) =1a(26) =11a(27) =54a(28) =156a(29) =294