a(n) = T(2n-1,n-1), T given by A026769. Also T(2n+1,n+1), T given by A026780.
A026773
a(n) = T(2n-1,n-1), T given by A026769. Also T(2n+1,n+1), T given by A026780.
Terms
- a(0) =1a(1) =4a(2) =17a(3) =76a(4) =352a(5) =1674a(6) =8129a(7) =40156a(8) =201236a(9) =1020922a(10) =5234660a(11) =27089726a(12) =141335846a(13) =742712598a(14) =3927908193a(15) =20891799036a(16) =111688381228a(17) =599841215226
External references
- oeis: A026773