**For n = 0, 1, 2, a(n) = n; thereafter, a(n) = 2*a(n-1)-a(n-2)+a(n-3).**

*0, 1, 2, 3, 5, 9, 16, 28, 49, 86, 151, 265, 465, 816, 1432, 2513, 4410, 7739, 13581*

*2 seqfan posts*

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

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