122969

Appears in sequences

• Number of (2+2) X (n+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=15A252963
• Numbers k such that the decimal expansion of the k-th harmonic number starts with the digits of k, in the same order.at n=6A337904