The nth term in the sequence means an unspecified number an unspecified distance along the series. 8 16 32 64 128... n. It is also a shothand notation so the reader knows that the sequence continues.

Reducing squares 100 = 10² 81 = 9² 64 = 8² 49 = 7² 36 = 6² so next is 25 = 5² ---------------------------------- For the given pattern the nth term (n = 1 to 5) is given by: t(n) = n² - 22n + 121

From the first term subtract 19 to get the second, and continue to subtract the next smaller odd number to proceed down the line: 100 (-19) 81 (-17) 64 (-15) 49 (-13) 36 (-11) 25 (-9) 16

From the upper left corner draw a line from 100 to 81 to 64 to 9 to 4 to 64 to 1 to 49 to 16 to 36 to 9 to 4 to 16 to 25 to 81 to 36 to 64 to the Minotaur block. UGH !