Number of ways to place 5 nonattacking grasshoppers on a chessboard of size n x n.

A190397

Number of ways to place 5 nonattacking grasshoppers on a chessboard of size n x n.

Terms

    a(0) =0a(1) =0a(2) =28a(3) =1668a(4) =29092a(5) =252584a(6) =1441634a(7) =6222996a(8) =22004086a(9) =66972760a(10) =181332416a(11) =446905476a(12) =1019470032a(13) =2179712872a(14) =4410518630a(15) =8510498516a(16) =15756224370a(17) =28128603736a(18) =48622240660a(19) =81660504068a(20) =133643402268a(21) =213660267432

External references