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%I #17 Jun 26 2022 23:56:22
%S 0,1,2,6,19,71,274,1117,4650,19819,85710,375712,1664203,7439593,
%T 33515758,152019560,693625265,3181528275,14661581030,67850297506,
%U 315187646601,1469195636293,6869889703638,32215399021901,151467334017864,713881817440421,3372142139764434
%N Same as A038392 except for initial term.
%H B. N. Cyvin, E. Brendsdal, J. Brunvoll, S. J. Cyvin, <a href="http://dx.doi.org/10.1007/BF00811082">A class of polygonal systems representing polycyclic conjugated hydrocarbons: Catacondensed monoheptafusenes</a>, Monat. f. Chemie, 125 (1994), 1327-1337.
%H S. J. Cyvin, B. N. Cyvin, J. Brunvoll and E. Brendsdal, <a href="https://doi.org/10.1021/ci00021a026">Enumeration and Classification of Certain Polygonal Systems Representing Polycyclic Conjugated Hydrocarbons: Annelated Catafusenes</a>, Journal of Chemical Information and Modeling [formerly, J. Chem. Inform. Comput. Sci.], 34 (1994), pp. 1174-1180.
%H F. Harary and R. C. Read, <a href="https://doi.org/10.1017/S0013091500009135">The enumeration of tree-like polyhexes</a>, Proc. Edinburgh Math. Soc. (2) 17 (1970), 1-13.
%H Eric W. Weisstein, <a href="http://mathworld.wolfram.com/Fusene.html">Fusene</a>, MathWorld-A Wolfram Web Resource.
%F G.f.: (2*(1-z)^2 - (1-z)*f(z) - f(z^2))/(4*z*(1-z)) where f(z) = sqrt(1 - 6z + 5z^2). - _Emeric Deutsch_, Mar 14 2004
%Y Cf. A121178.
%K nonn
%O 0,3
%A _N. J. A. Sloane_
%E More terms from _Emeric Deutsch_, Mar 14 2004