**Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) +a(n-4).**

*0, 0, 1, 0, 1, 2, 4, 7, 14, 27, 52, 100, 193, 372, 717, 1382, 2664, 5135, 9898, 19079*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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