18150270600
domain: N
Appears in sequences
- Twice central binomial coefficients.at n=18A028329
- A Catalan transform of (1 + 2*x)/(1 - 2*x).at n=18A100320
- a(n) = number of n-lettered words in the alphabet {1, 2} with as many occurrences of the substring (consecutive subword) [1, 1] as of [2, 2].at n=38A182027
- Z-sequence for the Riordan triangle A111125.at n=18A217477