$$2 , 6 , 12 , 20 , 30 , - 56$$
$-56,2,6,12,20,30$
$$2$$
$$2,6$$
$$2,6,12$$
$$2,6,12,20$$
$$2,6,12,20,30$$
$$-56,2,6,12,20,30$$
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$2,6,12,20,30,-56$