Each number is the square of the previous number.
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243
9 243 - 81 = 162 81 - 27 = 54 162 = 54 * 3 54 = 18 * 3 27 - 18 = 9
It is 3 followed by 1
'81' Hence 3^(0) = 1 3(1) = 3 3^(2) = 9 3^(3) = 37 3^(4) = 81 3^(5) = 243 3^(n) depending on the numerical position of 'n'.
Treble (in math) is a verb meaning to make 3 times larger (multiply by 3). So each number in the sequence is found by multiplying the previous number by 3.1 x 3 = 33 x 3 = 99 x 3 = 2727 x 3 = 81etc.So the sequence that you're interested in is {1,3,9,27,81}