Number of ways to place 5 nonattacking grasshoppers on a toroidal chessboard of size n x n.
A190400
Number of ways to place 5 nonattacking grasshoppers on a toroidal chessboard of size n x n.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =976a(4) =18510a(5) =201528a(6) =1232448a(7) =5637824a(8) =20502396a(9) =63720920a(10) =174647286a(11) =434439792a(12) =997037470a(13) =2141831160a(14) =4348204020a(15) =8412482304a(16) =15605151496a(17) =27903377016a(18) =48291880442a(19) =81188237680a(20) =132977239290a(21) =212739639640
External references
- oeis: A190400