32016

Appears in sequences

• Number of rooted trees of 2n+1 nodes with every leaf at height n.at n=20A074045
• Numbers n such that sopf(n) = sopf(n+1) - sopf(n-1), where sopf(x) = sum of the distinct prime factors of x.at n=11A076525
• Enneagonal numbers for which the product of the digits is also an enneagonal number.at n=33A117052
• Number of nX3 0..1 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.at n=9A223587
• Perimeter (rounded down) of Pi-shaped box fractal after n iterations.at n=11A242823
• Numbers k such that (17*10^k - 131)/3 is prime.at n=19A297416
• a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/(2*k-1))^k.at n=51A350167
• Central circular Delannoy numbers: a(n) is the number of Delannoy loops on an n X n toroidal grid.at n=6A361743