171195

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 2.at n=20A049923
• Triangle read by rows: The number of chord diagrams on 2n vertices with m marked chords.at n=31A322176
• Triangle read by rows: The number of chord diagrams on 2n vertices with m marked chords.at n=32A322176