Riddle: I can be heavy or light, but you'll never see me with…

Riddle

what-sequence-counts-without-numbers-starts-at-one-yet

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i-start-with-one-then-two-then-three-and-so-on-without

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i-can-measure-the-width-of-a-smile-or-the-length-of-a

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i-start-at-2-then-double-each-time-im-under-40-and-end

Riddle

i-am-a-sequence-that-starts-with-one-and-grows-to