61663

Appears in sequences

• Number of similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.at n=26A028492
• Total number of parts that are the smallest part or the largest part in all partitions of n.at n=32A182978
• Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=16A192422
• Number of length 4 1..(n+1) arrays with every leading partial sum divisible by 2, 3, 5 or 7.at n=19A258635
• Numbers k whose trajectory under the Reverse and Add! operation carried out in base 16 does not reach a palindrome and (presumably) does not join the trajectory of any term m < k.at n=22A344119