168454

Appears in sequences

• For a polynomial P(m) with rational coefficients, denote by lcmd(P) the LCM of the denominators of all its coefficients. Then a(n) = lcmd(Sum_{i=1..m} (i^n*Sum_{j=1..i} j^n))/ lcmd((Sum_{i=1..m} i^n)^2).at n=45A202533
• a(n) is the sum of all symmetric valleys in the set of Catalan words of length n.at n=12A371964