35357671

Appears in sequences

• Dirichlet convolution of b_n=1 with Catalan numbers.at n=16A034731
• a(n) = C(n) + 1 - 0^n where C(n) = A000108(n).at n=16A141351
• G.f.: 1 + Sum_{n>=1} x^n * exp( Sum_{k>=1} binomial(2*n*k-1, n*k) * x^(n*k)/k ).at n=17A206777
• Number of Dyck n-paths with equally spaced returns.at n=17A216435
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UH, HU, HD and DH.at n=32A329696