90266

Appears in sequences

• Expansion of 1 / ((1+x)*(1-2x)*(1-3x)*(1-4x)).at n=7A099110
• Number of trivially compound perfect squared rectangles of order n up to symmetries of the rectangle and its subrectangles.at n=17A217374
• Triangle read by rows: Number of ideals in Partial Brauer Monoid PB_n.at n=30A276773
• a(n) = Sum_{k=0..n} (k+1) * 2^(n-k) * binomial(2*k,2*(n-k)).at n=9A390732