**a(0)=0; a(1)=1; a(2n)=4*Sum_{k=0...n-1}a(2n+1); a(2n+1)=a(2n)+a(2n-1).**

*0, 1, 4, 5, 24, 29, 140, 169, 816, 985, 4756, 5741, 27720, 33461, 161564, 195025*

*1 seqfan posts*

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

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