This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A135388 Number of (directed) Eulerian circuits on the complete graph K_{2n+1}. 1
 2, 264, 129976320, 911520057021235200, 257326999238092967427785160130560, 6705710151431658873046319662156165939200000000000000, 32132958735643556926111996291480203406145819659840760945049600000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES B. D. McKay, Applications of a technique for labeled enumeration, Congress. Numerantium, 40 (1983), 207-221. LINKS Brendan D. McKay and Robert W. Robinson, Asymptotic enumeration of Eulerian circuits in the complete graph, Combinatorics, Probability and Computing, 7 (1998), 437-449. Eric Weisstein's World of Mathematics, Complete Graph Eric Weisstein's World of Mathematics, Eulerian Cycle FORMULA a(n) = A007082(n) * (n-1)!^(2*n+1). MATHEMATICA Table[2 Length[FindEulerianCycle[CompleteGraph[2 n + 1], All]], {n, 3}] (* Eric W. Weisstein, Jan 09 2018 *)   (* a(3) requires a very large amount of memory *) CROSSREFS Cf. A007082. Sequence in context: A137105 A216984 A007082 * A238983 A188964 A278771 Adjacent sequences:  A135385 A135386 A135387 * A135389 A135390 A135391 KEYWORD nonn AUTHOR Max Alekseyev, Dec 10 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)