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A104431
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Number of ways to split 1, 2, 3, ..., 5n into n arithmetic progressions each with 5 terms.
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2
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1, 2, 4, 10, 21, 59, 125, 349, 848, 2224, 5210, 15720, 37096, 98241, 245251, 684475, 1703174, 4915084
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