172576

Appears in sequences

• Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155240
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.at n=12A260537
• a(0)=1; thereafter a(n) = Sum_{k=2..n+1} A006206(k).at n=29A286271