The article is here: http://home.ptd.net/~artnpeg
For smaller values of the mean, the Poisson Distribution with cumulative sums is used.
For larger values, the Binomial Distribution is simulated and the complementary error
function is used to find probabilities. A very simple method of finding the probabilities of
long runs of heads or tails in large numbers of tosses is given. The results are compared to the results of solving by the Fibonacci N-step method.

ArtK