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A185015 Characteristic function of 5. 16


%S 0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N Characteristic function of 5.

%C Number of connected 2-regular (simple) graphs with girth exactly 5.

%C The Euler transformation of this sequence is A079998.

%F a(n) = A185115(n) - A185116(n).

%Y Characteristic function of g: A000007 (g=0), A063524 (g=1), A185012 (g=2), A185013 (g=3), A185014 (g=4), this sequence (g=5), A185016 (g=6), A185017 (g=7).

%K nonn,easy

%O 0,6

%A _Jason Kimberley_, Sep 30 2011

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)