176800

Appears in sequences

• Even hexagonal pyramidal numbers.at n=31A015226
• a(n,k) equals (1/n!) multiplied by the count of permutations with cycle length k in all products u v u^-1 v^-1 over all permutations u and v of length n.at n=50A191716
• Numbers c such that there is a Pythagorean triple (a,b,c) such that (A001414(a), A001414(b), A001414(c)) is also a Pythagorean triple.at n=5A337540
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,0) = 0^n and T(n,k) = k * Sum_{r=0..n} binomial(n,r) * binomial(n+2*r+k,n)/(n+2*r+k) for k > 0.at n=61A378236
• a(n) is the total number of vertices of degree 3 in Catalan word grid graphs with n parts.at n=7A390116