99774

Appears in sequences

• Next-to-middle coefficient in expansion of Product_{k=1..n} (1 + x^k).at n=22A068202
• Number of solutions to +- 1 +- 2 +- .. +- n = 2.at n=23A113036
• Table read by antidiagonals: T(n,k) is the number of idempotent n X n 0..k matrices of rank 1.at n=41A224524
• Number of idempotent 6X6 0..n matrices of rank 1.at n=3A224528