Snowlife: Playing with cellular automata B3/S1237

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To view this you can use golly and program the rule B3/S1237 http://golly.sourceforge.net .

How could i reproduce this without golly ? what are the rules ?

The notation "B3/S1237" means a dead cell becomes alive (is "born") if it has 3 live neighbors, and a live cell survives if the number of live neighbors is 1, 2, 3 or 7.

https://en.wikipedia.org/wiki/Life-like_cellular_automaton

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