Number of ways of placing non-attacking knights on an n X n chessboard symmetric about both diagonal and antidiagonal.
A130666
Number of ways of placing non-attacking knights on an n X n chessboard symmetric about both diagonal and antidiagonal.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =21a(5) =89a(6) =248a(7) =1652a(8) =5760a(9) =59789a(10) =268529a(11) =4367552a(12) =24922412a(13) =641484896a(14) =4607113999a(15) =188770443286
External references
- oeis: A130666