Iteration-exercises: article on Bell-numbers

I just compiled the linked article on Bell-numbers for the OEIS-seqfan-community (and for myself,...)

It is an "aside-exercise" touching the iteration-theme with Stirling-numbers 2'nd kind; for our forum it may be interesting since it gives another view into the commons of my matrix-lingo.

Have fun -

[update] The article increases. I've just uploaded a third version [/update]
Gottfried Helms, Kassel

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