505500

Appears in sequences

• Number of quasi-alternating permutations of length n.at n=8A001758
• Triangle read by rows: T(n,k) is the number of permutations of [n] with k alternating runs (n>=2, k>=1).at n=43A059427
• Numbers k such that k and k^2 use only the digits 0, 2, 3 and 5.at n=39A136887
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 7.at n=51A136889
• Boustrophedon transform of the Catalan numbers A000108.at n=9A231894