puzzle - Formula to this pattern? $1$, $11$, $21$, $1211$, $111221

next 1221 Purchase the NFPA 1221 standard to ensure compliance with emergency services communication systems requirements.. Virtual channel 15.1, Cox 1011, Spectrum 1221. Use the TV schedules pages as a TV guide for KPBS, KPBS2, KPBS Create, and PBS Kids.

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