This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A045909 #13 Mar 27 2021 23:50:39 %S A045909 0,0,1,8,39,190,861,3943,17867,81496,372378,1709842,7879360,36454004, %T A045909 169239651,788311290,3683018475,17255646688,81056033636,381668479192, %U A045909 1801188588566,8517994717214,40360814900566,191589547228523,911009396044132,4338777661726040 %N A045909 Number of unsymmetrical catafusenes with n hexagons (see reference for precise definition). %C A045909 Column C_s of Table 6 in Cyvin et al. Computed by subtracting all the other symmetry classes from the total. - _Sean A. Irvine_, Mar 27 2021 %H A045909 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. %F A045909 a(n) = A045906(n) - A045907(n) - A045908(n/2) - A342554(n/2) - A342570(n/2) - 2*A030529(n/4) - A055879(n/4) - [n=0] with sequences assumed to be 0 for non-integer arguments. - _Sean A. Irvine_, Mar 27 2021 %Y A045909 Cf. A045906, A045907, A045908, A342554, A342570, A030529, A055879. %K A045909 nonn %O A045909 0,4 %A A045909 _N. J. A. Sloane_ %E A045909 More terms from _Sean A. Irvine_, Mar 27 2021