A015035 q-Catalan numbers (binomial version) for q=5.
1, 1, 26, 16401, 256754526, 100333200992026, 979891646733527648276, 239235033472903543542533976401, 1460179250460591912887733380834635929526
Offset: 0
Formula
{1 / (n+1)_q} {2 n choose n}_q.