Duplicate of A082280.

Terms

a(0) =1a(1) =5a(2) =13a(3) =31a(4) =71a(5) =160a(6) =355a(7) =777a(8) =1681a(9) =3603a(10) =7677a(11) =16272a(12) =34323a(13) =72119a(14) =151036