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A186745
Number of connected regular simple graphs on n vertices with girth exactly 5.
1
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 2, 0, 8, 0, 48, 0, 450, 1, 5753, 8, 90684, 3917, 1736764, 4131991, 163457964, 4018022149, 119021971348
OFFSET
0,13
FORMULA
a(n) = A186725(n) - A186726(n).
CROSSREFS
Sequence in context: A347596 A211163 A239275 * A109573 A305809 A349139
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Apr 03 2012
EXTENSIONS
a(26) corrected by the author, due to correction of A186725, May 19 2017
STATUS
approved