**a(n) is the period k such that binomial(m, n) (mod 10) = binomial(m + k, n) (mod 10).**

*1, 10, 20, 60, 240, 1200, 7200, 50400, 403200, 3628800, 36288000, 399168000*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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