

A129435


Number of isomorphism classes of 7regular multigraphs of order 2n, loops allowed.


8




OFFSET

1,1


COMMENTS

Computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/


LINKS

Table of n, a(n) for n=1..6.
R. C. Read, The enumeration of locally restricted graphs (I), J. London Math. Soc. 34 (1959) 417436.


FORMULA

a(n)=N\{S_{2n}[S_7] * S_{7n}[S_2]\}


CROSSREFS

Cf. A129434, A129424, A129427, A129429, A129431, A129433, A129437
Sequence in context: A260025 A218884 A059105 * A129702 A220776 A180818
Adjacent sequences: A129432 A129433 A129434 * A129436 A129437 A129438


KEYWORD

nonn


AUTHOR

Brendan McKay, Apr 15 2007


EXTENSIONS

Using equation (5.8) of Read 1959, McKay's terms were verified by, and new term a(6) was computed by Jason Kimberley, Nov 09 2009


STATUS

approved



