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A129435 Number of isomorphism classes of 7-regular multigraphs of order 2n, loops allowed. 8
4, 101, 12782, 8584767, 20104116089, 122644465172798 (list; graph; refs; listen; history; text; internal format)
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) 417-436.

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

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Last modified June 16 06:46 EDT 2019. Contains 324145 sequences. (Running on oeis4.)