60520

Appears in sequences

• Triangle read by rows: T(n,k) = binomial(2n+1, n-k)*Fibonacci(2k+1), 0 <= k <= n.at n=41A103245
• a(n) is the optimal wire-length for an n X n grid.at n=40A195647
• Numbers m such that sigma(m)*tau(m) is a square but sigma(m)/tau(m) is not an integer.at n=19A327831