**a(n) = a(n-1) + c(n-2) for n >= 3, a( ) increasing, given a(1)=1, a(2)=3; where c( ) is complement of a( ).**

*1, 3, 5, 9, 15, 22, 30, 40, 51, 63, 76, 90, 106, 123, 141, 160, 180, 201, 224, 248, 273*

*1 seqfan posts*

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

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