Number of ways to place n nonattacking composite pieces queen + rider[1,5] on an n X n chessboard.
A189875
Number of ways to place n nonattacking composite pieces queen + rider[1,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =0a(6) =0a(7) =0a(8) =40a(9) =52a(10) =152a(11) =260a(12) =1192a(13) =4144a(14) =18408a(15) =71552a(16) =312936a(17) =1498156a(18) =7854672a(19) =44923706a(20) =213840604a(21) =1156549592
External references
- oeis: A189875