108809

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation.at n=17A146811
• Hypotenuses of primitive Pythagorean triples in A195561 and A195562.at n=7A195564
• x-values in the solution to 17*x^2 - 16 = y^2.at n=8A199772