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n 1    2      3         4             5                      6              7              8          

   7, 12,   40,   222,   1742   (1744),   17390,    208608, 2920414

   2,   4,     6,       8,      10,         10,         12,            14 (multiply by 2n)

 14, 48, 240, 1776, 17420 (17440), 208680, 2920512

  -2, -8,  -18,    -32,     -30,        -50,       -72,           -98 (subtract 2n2)

Red shows incorrect term and green shows the correct term.

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