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Each term a(n) seems to be a multiple of A033879(n). Factor (quotient) is negative at least for 16, 32, 48, 64, 72, 80, 96, 112, 128, 144, 160, 176, 192, 200, 208, 216, 224, 240, 243, 256, 272, 288, 304, 320, 324, 336, 352, 368, 384, 392, 400, 416, 432, 448, 464, 480, 486, ...
1, 2, 6, 1, 20, 0, 42, 0, 10, 22, 110, -16, 156, 60, 96, -1, 272, -15, 342, -12, 220, 184, 506, -12, 76, 270, 14, 0, 812, -492, 930, -2, 612, 490, 792, -38, 1332, 624, 880, -10, 1640, -660, 1806, 48, 132, 940, 2162, 56, 246, 63, 1560, 84, 2756, -36, 2128, -8, 1972, 1534, 3422, -1248, 3660, 1764, 330, -3, 3036, -996, 4422
1,2
Each term a(n) seems to be a multiple of A033879(n).
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Antti Karttunen, Jun 06 2021
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