a(n) = 24*A274300(n) + 14.

Terms

a(0) =38a(1) =38a(2) =38a(3) =134a(4) =326a(5) =326a(6) =326a(7) =1862a(8) =1862a(9) =8006a(10) =20294a(11) =44870a(12) =94022a(13) =192326a(14) =192326a(15) =585542a(16) =1371974a(17) =2944838a(18) =2944838