

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
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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) 743751.
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) 743751. [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 A096689 A039682
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



