Some other resources:

The github repo for their JS handwriting prediction library:

https://github.com/hardmaru/rnn-tutorial

Experiments in Handwriting with a Neural Network:

https://distill.pub/2016/handwriting/

Related work, Draw Together with a Neural Network:

https://magenta.tensorflow.org/sketch-rnn-demo

Previous HN discussion:

https://news.ycombinator.com/item?id=14372628