Number of ways to place n non-attacking semi-knights on an n x n chessboard.

A182563

Number of ways to place n non-attacking semi-knights on an n x n chessboard.

Terms

    a(0) =1a(1) =6a(2) =70a(3) =1289a(4) =33864a(5) =1148760a(6) =47700972a(7) =2344465830a(8) =133055587660

External references