310528

Appears in sequences

• Number of (n+2) X 7 0..3 arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=7A186877
• Number of (n+2)X10 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.at n=4A186880
• Expansion of e.g.f.: 2*cos(r*x)^2 / (1 + cos(r*x)^2) where r = sqrt(2), even terms only.at n=5A263249