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Search: id:A025580
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| A025580 |
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a(n) = (1/1 - 1/(n-1) + ... + d/binomial(n-[ n/2 ],[ n/2 ]))*L, where L = LCM{1, n-1, ..., binomial(n-[ n/2 ],[ n/2 ])}, d = (-1)^n. |
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| 1, 0, 1, 5, 13, -1, 41, 383, 901, -47, 1945, 26141, 29368, -6359, 296509, 345525, 756291, -197211, 10483329, 225371001, 242537898, -3394965, 204481239, 5215763433
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