This site is supported by donations to The OEIS Foundation.

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A185244 Number of disconnected 4-regular simple graphs on n vertices with girth at least 4. 17
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 2, 15, 35, 247, 1692, 17409, 197924, 2492824, 33117880, 461597957, 6709514218, 101153412903, 1597440868898 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,19 LINKS FORMULA a(n) = A185344(n) - A033886(n) = Euler_transformation(A033886)(n) - A033886(n). a(n) = A185044(n) + A185245(n). CROSSREFS 4-regular simple graphs with girth at least 4: A033886 (connected), this sequence (disconnected), A185344 (not necessarily connected). Disconnected 4-regular simple graphs with girth at least g: A033483 (g=3), this sequence (g=4), A185245 (g=5), A185246 (g=6). Disconnected k-regular simple graphs with girth at least 4: A185214 (any k), A185204 (triangle); specified degree k: A185224 (k=2), A185234 (k=3), this sequence (k=4), A185254 (k=5), A185264 (k=6), A185274 (k=7), A185284 (k=8), A185294 (k=9). Sequence in context: A202730 A009773 A185044 * A006929 A216613 A215900 Adjacent sequences:  A185241 A185242 A185243 * A185245 A185246 A185247 KEYWORD nonn,more,hard AUTHOR Jason Kimberley, Feb 22 2011 EXTENSIONS a(31) appended by the author once A033886(23) was known, Nov 03 2011 a(31) corrected by the author, Jan 05 2013 STATUS approved

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

Content is available under The OEIS End-User License Agreement .