6655170642

Appears in sequences

• 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 array such that all positions are mutually isolated. Two positions (s,t),(u,v) are considered as isolated from each other if min(abs(s-u),abs(t-v))>1.at n=44A098487
• Number of ways to place n nonattacking kings on an n X n board.at n=9A201513
• Number of ways to place 9 nonattacking kings on an n X n board.at n=8A201771