Erroneous version of A045535.

Terms

a(0) =7a(1) =23a(2) =71a(3) =311a(4) =479a(5) =1559a(6) =5711a(7) =10559a(8) =18191a(9) =31391a(10) =307271a(11) =366791a(12) =366791a(13) =2155919