In the following number series find the wrong term. 1, 3, 9, 31, 128, 651, 3913

The pattern is: (term × position) - position, where position starts at 2. Checking: 1×2-2=0 (not 3). Let me verify differently: 3 = 1×2+1, 9=3×3+0, 31=9×4-5... this doesn't work. Try: 1×2+1=3, 3×3=9, 9×4-5=31, 31×5-27=128, 128×6+63=651, 651×7+... The adjustment pattern: +1, +0, -5, -27, +63... Try: term × n - n where n increases: 1×2+1=3, 3×3=9, 9×4-5=31, 31×5-27=128. The subtractions are 1×1-1, 3×3-9... Actually: 3 = 1×3, 9=3×3, 31≠9×4. Let's try: (previous × n) + (n-1): 1×2+1=3, 3×3+0=9, 9×4-5=31, 31×5-27=128. The additions are: +1, +0, -5, -27. Pattern: 1-1=0, 0-5=-5, -5-22=-27. Differences: 1, 5, 22. Not clear. Try checking at 128: If pattern holds, 128×6-? should give 651. 128×6=768, 768-651=117. Previous adjustment was 27. 27 to 117 is +90. Previous jump was 5 to 27 = +22. This is irregular. Let's verify 128 is wrong by trying: 31×5-22=133, 133×6-18=780. Actually checking: 1, 3, 9, 31, 129, 651... If 128→129, then 9×4-5=31, 31×5-26=129, 129×6-27=747≠651. Let's try: 1×2+1=3, 3×3=9, 9×4-5=31, 31×4+5=129, 129×5+6=651. Multiplier fluctuates. Given options, 128 seems to be the wrong term.