a(n) = T(2n-1,n), where T is the array defined in A025177.
A025183
a(n) = T(2n-1,n), where T is the array defined in A025177.
Terms
- a(0) =0a(1) =4a(2) =20a(3) =111a(4) =616a(5) =3465a(6) =19668a(7) =112476a(8) =647088a(9) =3741156a(10) =21718520a(11) =126520240a(12) =739225704a(13) =4330188265a(14) =25421864580a(15) =149541718275a(16) =881200519200
External references
- oeis: A025183