A130649 Generalized ballot transform of generalized Catalan numbers C(2;n)=A064062(n).
1, 2, 8, 42, 260, 1796, 13372, 104922, 854964, 7165500
Offset: 0
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.