341320

Appears in sequences

• Number of 4-step one or two space at a time rook's tours on an n X n board summed over all starting positions.at n=31A187289
• Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1 <= k <= m positions can be picked in an m X m square grid such that the picked positions have a central symmetry.at n=35A291717
• Numbers k such that k=(a+b)*c=a*b+c for more than one triple (a,b,c) with 1<c<a<=b.at n=13A329169