40913domain: NAppears in sequencesa(n) = Sum_{d divides n} (d!)^(n/d).at n=7A217576Partial sums of A299274.at n=39A299275Irregular triangle read by rows: T(n,k) for k <= n/2 is the number of partitions of the repunit A002275(n) into k nonzero complementary binary vectors having a common divisor > 1 in base 10.at n=63A378761