Number of ways to place 5 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.
A279439
Number of ways to place 5 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.
Terms
- a(0) =0a(1) =0a(2) =45a(3) =2304a(4) =34020a(5) =270720a(6) =1475145a(7) =6209280a(8) =21654864a(9) =65422080a(10) =176467005a(11) =434206080a(12) =990140580a(13) =2117816064a(14) =4288771305a(15) =8284308480a(16) =15355471680a(17) =27446584320a(18) =47501098029a(19) =79872376320a(20) =130866406020a(21) =209448328320a(22) =328150139625a(23) =504222960384a(24) =761083938000
External references
- oeis: A279439