89551

Appears in sequences

• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,2n-k), with T given by A027052.at n=9A027074
• Triangle T(n,k) (n>=1, rows have irregular lengths) giving number of arrangements of k nonattacking princes on an n X n staggered hexagonal torus board.at n=38A067015
• a(1) = 1 thereafter a(n) = Sum_{k=1..n-1} ceiling(a(n-k)/k).at n=24A100482
• Capped binary boundary codes for holeless strictly non-overlapping polyhexes (all orientations and rotations included).at n=42A258002