146680

Appears in sequences

• Triangle read by rows: T(n,k) is the number of 2k-cycles in the n X n grid graph (2 <= k <= floor(n^2/2), n >= 2).at n=31A302337
• Constant term in the expansion of (Sum_{k=0..n} k*(x^k + x^(-k)))^5.at n=4A318119
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where A(n,k) is the constant term in the expansion of (Sum_{j=0..n} j*(x^j + x^(-j)))^k.at n=49A322549
• a(n) = n * Sum_{d|n} binomial(d+3,4)/d.at n=39A343545