552420

Appears in sequences

• Number of double tangents of order n.at n=33A060784
• a(n) = 27*(n-1)*(n-2)*(n-3)*(3*n-8)/2.at n=11A064197
• Number of (n+3) X 9 0..1 matrices with each 4 X 4 subblock idempotent.at n=25A224566