51836

Appears in sequences

• Number of lines through exactly 2 points of an n X n grid of points.at n=23A018809
• G.f. = b(2)^2*b(4)/(x^5+x^4-x^3-x^2-x+1), where b(k) = (1-x^k)/(1-x).at n=19A266339
• Numbers k whose nearest neighbors have the same number of divisors, the same number of distinct prime factors, and the same sum of divisors.at n=12A294173
• Number of partitions of n with up to nine distinct kinds of 1.at n=23A320696