a(n) = A050314(2n+1,1): column 1 of triangle.

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =8a(5) =11a(6) =23a(7) =35a(8) =54a(9) =79a(10) =123a(11) =177a(12) =260a(13) =368a(14) =557a(15) =831a(16) =1160a(17) =1677a(18) =2346a(19) =3310a(20) =4545a(21) =6326a(22) =8611a(23) =11799a(24) =15805a(25) =21344a(26) =28352a(27) =37835a(28) =49701a(29) =65730