122713

Appears in sequences

• a(n) = floor(binomial(n,6)/6).at n=31A011852
• Number of (n+7)X12 0..1 matrices with each 8X8 subblock idempotent.at n=5A224594
• Number of (n+7)X13 0..1 matrices with each 8X8 subblock idempotent.at n=4A224595