a(n) = T(2n,n-1), where T is the array defined in A025177.
A025187
a(n) = T(2n,n-1), where T is the array defined in A025177.
Terms
- a(0) =1a(1) =3a(2) =16a(3) =84a(4) =459a(5) =2552a(6) =14378a(7) =81783a(8) =468622a(9) =2700926a(10) =15640800a(11) =90930523a(12) =530391615a(13) =3102491160a(14) =18192186330a(15) =106901798100a(16) =629361849402
External references
- oeis: A025187