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A185319
Number of, not necessarily connected, regular simple graphs on n vertices with girth at least 9.
7
1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 3, 2, 3, 2, 3, 2, 3, 2, 4, 3, 5, 4, 6, 5, 7, 6, 8, 8, 10, 10, 13, 13, 16, 17, 20, 21, 26, 27, 32, 35, 41, 44, 52, 56, 65, 72, 82, 90, 104, 114, 130, 144, 163, 180, 205, 226, 255, 283, 336
OFFSET
0,3
FORMULA
a(n) = A186729(n) + A185219(n).
CROSSREFS
Not necessarily connected regular simple graphs with girth at least g: A005176 (g=3), A185314 (g=4), A185315 (g=5), A185316 (g=6), A185317 (g=7), A185318 (g=8), this sequence (g=9).
Sequence in context: A025824 A230037 A211262 * A161232 A161056 A161260
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Dec 19 2012
STATUS
approved