Numbers to the left of the central numbers of the (2,3)-Pascal triangle A029600.

Terms

a(0) =2a(1) =2a(2) =2a(3) =7a(4) =2a(5) =9a(6) =2a(7) =11a(8) =24a(9) =2a(10) =13a(11) =35a(12) =2a(13) =15a(14) =48a(15) =85a(16) =2a(17) =17a(18) =63a(19) =133a(20) =2a(21) =19a(22) =80a(23) =196a(24) =308a(25) =2a(26) =21a(27) =99a(28) =276a(29) =504