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For challenges involving sequences, typically of numbers following some pattern.
1
vote
Stewie's sequence: + * - / + * - /
Ruby, 79 bytes
->(b,c,d){a=[b,c];(d-2).times{|i|a<<a[i].send(%i{+ * - /}[i%4],a[i+1]).to_f};a}
I suspect this is very far off from optimal (and I haven't looked at the other answers yet), but it's fu …