If you are looking for other examples.
Here's a wheel factorization of an indefinite sieve (primes) that was peer reviewed on codereview.stackexchange.com, see the final result in the last post by Will Ness: http://codereview.stackexchange.com/questions/92365/wheel-based-unbounded-sieve-of-eratosthenes-in-python which included two uses of accumulate(chain(...), ...).

Constructing and unpacking the list in a chain seems like an unnecessary overhead when all you are looking for is an initial value. The reason I suggested it as the 3rd argument is it is the "most" optional argument and mirrors reduce (though iterable, function is the reverse of reduce).