A146212(2*n).

Terms

a(0) =5a(1) =37a(2) =145a(3) =471a(4) =901a(5) =2185a(6) =3969a(7) =5563a(8) =11141a(9) =17293a(10) =21913a(11) =36479a(12) =50485a(13) =51661a(14) =90753a(15) =118355a(16) =139861a(17) =191445a(18) =238481