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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A000947 Number of free nonplanar polyenoids with n nodes and symmetry point group C_{2v}. 1 1, 2, 4, 10, 15, 44, 56, 177, 212, 706, 792, 2714, 2961 (list; graph; refs; listen; history; text; internal format) OFFSET 7,2 LINKS Table of n, a(n) for n=7..19. S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, Enumeration of polyene hydrocarbons: a complete mathematical solution, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, Enumeration of polyene hydrocarbons: a complete mathematical solution, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. [Annotated scanned copy] FORMULA a(n) = A000063(n + 2) - A000936(n). - Sean A. Irvine, Oct 15 2015 CROSSREFS Sequence in context: A128513 A048200 A058201 * A125245 A371896 A358317 Adjacent sequences: A000944 A000945 A000946 * A000948 A000949 A000950 KEYWORD nonn,more AUTHOR E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk) EXTENSIONS a(16)-a(19) and title improved by Sean A. Irvine, Oct 16 2015 STATUS approved

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Last modified August 27 18:02 EDT 2024. Contains 375471 sequences. (Running on oeis4.)