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A157064
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Number of integer sequences of length n+1 with sum zero and sum of absolute values 30
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0
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2, 90, 2252, 39500, 535502, 5930022, 55599992, 452715672, 3262336002, 21114177018, 124188986196, 670283877588, 3346707628446, 15564971674518, 67830161708592, 278406848295312, 1081149205136382, 3988232552194662
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