261192

Appears in sequences

• Number of (n+5)X9 0..2 matrices with each 6X6 subblock idempotent.at n=5A224632
• Number of (n+5)X11 0..2 matrices with each 6X6 subblock idempotent.at n=3A224634
• G.f. A(x) satisfies: A(x) = 1 / ((1 - x) * (1 - x * A(3*x))).at n=5A348858