681408

Appears in sequences

• Averages of twin prime pairs k such that k*7 and k/7 are squares.at n=13A154673
• Number of ways to place 3 nonattacking kings on an n X n toroidal board.at n=12A179404
• Number of (n+2) X 4 binary arrays avoiding patterns 001 and 101 in rows and columns.at n=23A202196
• Coefficients in expansion of Eisenstein series -q*(d/dq)(q*(d/dq)E_2).at n=26A282154
• Triangle read by rows, (3, 2)-Lah numbers.at n=12A371277