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A050456 Sum_{d|n, d=1 mod 4} d^4 - Sum_{d|n, d=3 mod 4} d^4. +0
2
1, 1, -80, 1, 626, -80, -2400, 1, 6481, 626, -14640, -80, 28562, -2400, -50080, 1, 83522, 6481, -130320, 626, 192000, -14640, -279840, -80, 391251, 28562, -524960, -2400, 707282, -50080, -923520, 1, 1171200, 83522, -1502400, 6481, 1874162, -130320 (list; graph; listen)
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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