login
A185316
Number of, not necessarily connected, regular simple graphs on n vertices with girth at least 6.
8
1, 1, 2, 1, 2, 1, 3, 2, 3, 2, 3, 2, 4, 3, 6, 4, 7, 5, 13, 7, 42, 10, 398, 13, 7592, 18, 181251, 25, 4624534, 33, 122090591, 45, 3328930034, 61, 93990693977, 106
OFFSET
0,3
FORMULA
a(n) = A186726(n) + A185216(n).
CROSSREFS
Not necessarily connected regular simple graphs with girth at least g: A005176 (g=3), A185314 (g=4), A185315 (g=5), this sequence (g=6), A185317 (g=7), A185318 (g=8), A185319 (g=9).
Sequence in context: A354713 A265893 A191372 * A053279 A046800 A338718
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Dec 12 2012
STATUS
approved