Catalan numbers with even index (A000108(2*n), n >= 0): a(n) = binomial(4*n, 2*n)/(2*n+1).
A048990
Catalan numbers with even index (A000108(2*n), n >= 0): a(n) = binomial(4*n, 2*n)/(2*n+1).
Terms
- a(0) =1a(1) =2a(2) =14a(3) =132a(4) =1430a(5) =16796a(6) =208012a(7) =2674440a(8) =35357670a(9) =477638700a(10) =6564120420a(11) =91482563640
External references
- oeis: A048990