39682

Appears in sequences

• Number of ordered 5-tuples of integers from [ 1,n ] with no common factors among quadruples.at n=20A015653
• Number of n X n binary arrays with all 1s connected, all corners 1, and no 1 having more than two 1s adjacent.at n=6A163732
• Number of n X 7 binary arrays with all 1s connected, all corners 1, and no 1 having more than two 1s adjacent.at n=6A163738
• Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=10A207141
• Numbers k such that (19*10^k + 101) / 3 is prime.at n=26A276672
• a(n) is the number of five element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units.at n=23A391498