**a(0) = 1, a(1) = 3, a(2) = 6; a(n), n>2 = 2*a(n-1) - a(n-2). a(n), n>2 = a(n-1) + 9.**

*1, 3, 6, 15, 24, 33, 42, 51, 60, 69, 78, 87, 96, 105, 114, 123, 132, 141, 150, 159, 168*

*1 seqfan posts*

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

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