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Search: id:A001998
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A001998 Bending a piece of wire of length n+1; walks of length n+1 on a tetrahedron; also non-branched catafusenes with a specified number of condensed hexagons.
(Formerly M1211 N0468)
+0
14
1, 2, 4, 10, 25, 70, 196, 574, 1681, 5002, 14884, 44530, 133225, 399310, 1196836, 3589414, 10764961, 32291602, 96864964, 290585050, 871725625, 2615147350, 7845353476, 23535971854, 70607649841, 211822683802, 635467254244, 1906400965570 (list; graph; listen)
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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.


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