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(-1)^n [2n+1] that's your sequence ^
or it could be (-1)^n[4n+1]
(-1)^n+1 (4n+1)
sorry I'm kind of tired today
but if we can find the formula to replicate that sequence.. just plug in n = 1000 ...
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4n + 1 alone would be... if we let n = 0,1,2 1, 5, 9
-11 + 4n maybe?
oh ,,, hmmm wait wait wait n = -2 ,-1 0 1 2
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