**a(0) = 0, a(1) = a(2) = a(3) = 1; thereafter, a(n) = a(n-1)+a(n-2)+a(n-4).**

*0, 1, 1, 1, 2, 4, 7, 12, 21, 37, 65, 114, 200, 351, 616, 1081, 1897, 3329, 5842, 10252*

*3 seqfan posts*

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

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