References to A121220

Number of fixed hexagonal polygons (or benzenoids) with n cells.
1, 3, 11, 44, 186, 813, 3640, 16590, 76663, 358195, 1688784, 8022273, 38351973

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Sat Feb 14 08:22:22 CET 2009    [seqfan] help needed entering sequences from Iwan Jensen's home page
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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