a(n) = T(2n-1,n), array T given by A048225.

Terms

a(0) =3a(1) =3a(2) =16a(3) =36a(4) =59a(5) =89a(6) =131a(7) =185a(8) =250a(9) =323a(10) =400a(11) =488a(12) =582a(13) =681a(14) =790a(15) =905a(16) =1024a(17) =1147a(18) =1277a(19) =1419a(20) =1565a(21) =1716a(22) =1874a(23) =2036a(24) =2204a(25) =2375a(26) =2554a(27) =2738a(28) =2926a(29) =3123