51590

Appears in sequences

• Numbers k such that sum of divisors of k^2 is a square.at n=13A008847
• Number of nX7 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=4A207751
• Number of 5Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=6A207754
• Expansion of x*(1 + 4*x + x^2)/((1 - x)^5*(1 + x)^4).at n=40A290055