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A018190
Number of planar simply-connected polyhexes (or benzenoid hydrocarbons) with n hexagons.
+0
25
1, 1, 3, 7, 22, 81, 331, 1435, 6505, 30086, 141229, 669584, 3198256, 15367577, 74207910, 359863778, 1751594643, 8553649747, 41892642772, 205714411986, 1012565172403, 4994807695197, 24687124900540, 122238208783203
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Maintained by
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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