186880

Appears in sequences

• Expansion of 1/(1+2*x-2*x^3).at n=27A077988
• Expansion of (2/(3*sqrt(1-4*z)-1+4*z))*((1-sqrt(1-4*z))/(2*z))^k with k=9.at n=7A172066
• Number of ways to place n non-attacking bishops on a 2 X 2n board.at n=7A199033
• Numbers n such that A048720(n, A065621(n)) is a perfect square, but n is not in A023758.at n=25A277807