Left half of Poupard's triangle, A008301.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =10a(6) =34a(7) =68a(8) =94a(9) =104a(10) =496a(11) =992a(12) =1420a(13) =1712a(14) =1816a(15) =11056a(16) =22112a(17) =32176a(18) =40256a(19) =45496a(20) =47312a(21) =349504a(22) =699008a(23) =1026400a(24) =1309568a(25) =1528384a(26) =1666688a(27) =1714000a(28) =14873104a(29) =29746208