

A185214


Number of disconnected regular simple graphs on n vertices with girth at least 4.


17



0, 0, 1, 1, 2, 1, 2, 1, 3, 2, 4, 3, 7, 5, 10, 8, 22, 12, 54, 20, 218, 62, 1436, 1731, 27810, 197981, 2613814, 33117962, 463707741, 6709514340, 102306352539, 1597440872801
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OFFSET

0,5


LINKS

Table of n, a(n) for n=0..31.
Jason Kimberley, Index of sequences counting disconnected kregular simple graphs with girth at least g


CROSSREFS

This sequence is the row sum sequence of A185204.
Regular graphs, of any degree, with girth at least 4: A186724 (connected), this sequence (disconnected), A185314 (not necessarily connected).
Disconnected kregular simple graphs with girth at least 4: this sequence (any k), A185204 (triangle); specified degree k: A185224 (k=2), A185234 (k=3), A185244 (k=4), A185254 (k=5), A185264 (k=6), A185274 (k=7), A185284 (k=8), A185294 (k=9).
Sequence in context: A161257 A161282 A226517 * A241719 A269572 A029198
Adjacent sequences: A185211 A185212 A185213 * A185215 A185216 A185217


KEYWORD

nonn,more,hard


AUTHOR

Jason Kimberley, Mar 26 2012


EXTENSIONS

a(31) corrected by the author, propagated from A185244, Jan 05 2013


STATUS

approved



