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EXAMPLE
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Triangle begins
1,
-2, 1,
4, -8, 1,
-8, 36, -12, 1,
16, -128, 80, -16, 1,
-32, 400, -400, 140, -20, 1,
64, -1152, 1680, -896, 216, -24, 1,
-128, 3136, -6272, 4704, -1680, 308, -28, 1,
256, -8192, 21504, -21504, 10560, -2816, 416, -32, 1,
-512, 20736, -69120, 88704, -57024, 20592, -4368, 540, -36, 1,
1024, -51200, 211200, -337920, 274560, -128128, 36400, -6400, 680, -40, 1
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