223728

Appears in sequences

• Number of (n+2) X 4 binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals.at n=9A202526
• Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.at n=9A251871
• Expansion of e.g.f. exp( x/3 * (exp(3 * x) - 1) ).at n=8A354312