**a(n) = 3*a(n-1) + a(n-3) with a(0)=1, a(1)=2, a(2)=6.**

*1, 2, 6, 19, 59, 183, 568, 1763, 5472, 16984, 52715, 163617, 507835, 1576220*

*2 seqfan posts*

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

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