**a(0)=-1, a(1)=-1, a(n)=-3*a(n-1)-a(n-2) for n>1.**

*1, 1, 4, 11, 29, 76, 199, 521, 1364, 3571, 9349, 24476, 64079, 167761*

*1 seqfan posts*

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

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