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A185264 Number of disconnected 6-regular simple graphs on n vertices with girth at least 4. 12
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 10, 7, 277, 3742, 483330, 69827771, 14836620025 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,29
LINKS
FORMULA
a(n)
= A185364(n) - A058276(n)
= Euler_transformation(A058276)(n) - A058276(n).
CROSSREFS
6-regular simple graphs with girth at least 4: A058276 (connected), this sequence (disconnected), A185364 (not necessarily connected).
Disconnected k-regular simple graphs with girth at least 4: A185214 (any k), A185204 (triangle); specified degree k: A185224 (k=2), A185234 (k=3), A185244 (k=4), A185254 (k=5), this sequence (k=6), A185274 (k=7), A185284 (k=8), A185294 (k=9).
Sequence in context: A210283 A227473 A038309 * A128357 A024134 A180197
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Feb 22 2011
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)