a(n) = Sum_{k=0..n-1} binomial(n-1,k)^2 * binomial(n,k).
A181067
a(n) = Sum_{k=0..n-1} binomial(n-1,k)^2 * binomial(n,k).
Terms
- a(0) =1a(1) =3a(2) =16a(3) =95a(4) =606a(5) =4032a(6) =27616a(7) =193167a(8) =1372930a(9) =9881498a(10) =71846160a(11) =526764680a(12) =3889340560a(13) =28888634400a(14) =215680108416
External references
- oeis: A181067