23650

Appears in sequences

• Powers of fifth root of 11 rounded down.at n=21A018144
• a(n+1) = 2*a(n-2) + a(n-1), with a(0) = 3, a(1) = 0, and a(2) = 2.at n=24A072328
• a(n) = 10 + floor( (1 + Sum_{j=1..n-1} a(j) )/3 ).at n=27A120155
• Number of n X n arrays of squares of integers summing to 7 with every element equal to at least one neighbor.at n=3A146201
• Number of intersection points outside the n-gon of all lines through pairs of vertices of a regular n-gon.at n=22A146213
• Number of polygons formed outside a regular n-gon when every pair of vertices of the n-gon are joined by an infinite line.at n=24A344311
• a(1) = 1; a(n) = a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=45A351620