20722

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 51.at n=34A020390
• Numbers that are the sum of eight fourth powers in exactly eight ways.at n=26A345840
• G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k + (n-k+1)*x) / (1 + k*x + (n-k+1)*x^2).at n=10A363110
• Number of 231-avoiding stabilized-interval-free permutations of size n.at n=12A363432