Number of ways to place n nonattacking composite pieces rook + semi-rider[4,4] on an n X n chessboard.
A189846
Number of ways to place n nonattacking composite pieces rook + semi-rider[4,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =114a(5) =628a(6) =4062a(7) =30360a(8) =251658a(9) =2308648a(10) =23351268a(11) =259031232a(12) =3091784268a(13) =39697601392a(14) =546982720164
External references
- oeis: A189846