74560

Appears in sequences

• Expansion of (2*x+4*x^2) / (1-2*x-2*x^2+2*x^3).at n=12A285185
• Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1 <= k <= m positions can be picked in an m X m square grid such that the picked positions have a central symmetry.at n=33A291717
• a(n) = 1 + F(2*n+1) - (F(n+4) - (-1)^n*F(n-2))/2 where F=A000045.at n=12A330051