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A025561
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a(n) = sum of the exponents in the prime factorization of LCM{1, n-1, ..., C(n-[ n/2 ],[ n/2 ])}.
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0
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0, 0, 1, 1, 3, 3, 4, 4, 6, 6, 7, 7, 8, 8, 9, 8, 10, 10, 11, 11, 12, 11, 12, 12, 13, 13, 14, 14, 15, 15
(list; graph; refs; listen; history; internal format)
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