317471

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2) + 3 with a(0)=1, a(1)=7.at n=9A055269
• Number of ways to place 4 nonattacking kings on an n X n board.at n=8A061997
• 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=31A098487