362852

Appears in sequences

• Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.at n=9A212419
• a(n) = Sum_{k=0..n} (2*k+3) * binomial(4*n-2*k+3,n-k)/(4*n-2*k+3).at n=7A390811