**a(1)=a(2)=1, a(n)=n-a(a(n-1))-a(a(n-2)).**

*1, 1, 1, 2, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 8, 9, 9, 9, 10, 11, 12, 12, 12, 13, 14, 15, 15, 15*

*1 seqfan posts*

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

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