a(n)=T(2n-1,n), array T given by A048212.

Terms

a(0) =2a(1) =5a(2) =18a(3) =35a(4) =60a(5) =94a(6) =134a(7) =180a(8) =232a(9) =291a(10) =357a(11) =430a(12) =515a(13) =610a(14) =710a(15) =815a(16) =932a(17) =1053a(18) =1181a(19) =1318a(20) =1462a(21) =1615a(22) =1776a(23) =1944a(24) =2116a(25) =2300a(26) =2496a(27) =2696a(28) =2907a(29) =3128