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Maxie D. Schmidt, <a href="https://arxiv.org/abs/2102.05842">New characterizations Exact formulas for partial sums of the summatory Möbius function of expressed by partial sums weighted by the Moebius Liouville lambda function</a>, arXiv:2102.05842 [math.NT], 2021-2022.
A. Knopfmacher, J. Knopfmacher , and R. Warlimont, "Ordered factorizations for integers and arithmetical semigroups", in Advances in Number Theory, (Proc. 3rd Conf. Canadian Number Theory Assoc., 1991), Clarendon Press, Oxford, 1993, pp. 151-165.
S. Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 292-295.
S. Steven R. Finch, <a href="/A001055/a001055.pdf">Kalmar's composition constant</a>, June 5, 2003. [Cached copy, with permission of the author]
Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/MultinomialCoefficient.html">Multinomial Coefficient</a>.
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(Python)
from math import prod, factorial
from sympy import factorint
def A008480(n): return factorial(sum(f:=factorint(n).values()))//prod(map(factorial, f)) # Chai Wah Wu, Aug 05 2023
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