The function n->ceil(sqrt(4*n))-floor(sqrt(2*n))-1 counts the number of squares strictly between 2n and 4n.

Maple 2016 gives the same output as what I get when I create a plot here:

Note, however, that Maple does not plot at least the point of interest (72.4), which is nevertheless an element of the graph:

[10, 2], [11, 2], [12, 2], [13, 2], [14, 2], [15, 2], [16, 2], [17, 3], [18, 2], [19, 2], [20, 2], [21, 3], [22, 3], [23, 3], [24, 3], [25, 2], [26, 3], [27, 3], [28, 3], [29, 3], [30, 3], [31, 4], [32, 3], [33, 3], [34, 3], [35, 3], [36, 3], [37, 4], [38, 4], [39, 4], [40, 4], [41, 3], [42, 3], [43, 4], [44, 4], [45, 4], [46, 4], [47, 4], [48, 4], [49, 4], [50, 4], [51, 4], [52, 4], [53, 4], [54, 4], [55, 4], [56, 4], [57, 5], [58, 5], [59, 5], [60, 5], [61, 4], [62, 4], [63, 4], [64, 4], [65, 5], [66, 5], [67, 5], [68, 5], [69, 5], [70, 5], [71, 5], [72, 4], [73, 5], [74, 5], [75, 5], [76, 5], [77, 5], [78, 5], [79, 5], [80, 5], [81, 5], [82, 6], [83, 6], [84, 6], [85, 5], [86, 5], [87, 5], [88, 5], [89, 5], [90, 5], [91, 6], [92, 6], [93, 6], [94, 6], [95, 6], [96, 6], [97, 6], [98, 5], [99, 5], [100, 5]

What's going wrong here?
Regards
Prof.G