Number of ways to place n nonattacking composite pieces rook + rider[4,4] on an n X n chessboard.
A189840
Number of ways to place n nonattacking composite pieces rook + rider[4,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =108a(5) =544a(6) =3264a(7) =23040a(8) =171072a(9) =1409664a(10) =12916224a(11) =131217408a(12) =1428028032a(13) =16709309440a(14) =210367491840
External references
- oeis: A189840