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%I A185016 #30 Jun 19 2024 09:14:26
%S A185016 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A185016 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 A185016 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A185016 Characteristic function of 6.
%C A185016 Number of connected 2-regular (simple) graphs with girth exactly 6.
%C A185016 The Euler transformation of this sequence is A079979.
%H A185016 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A185016 a(n) = A185116(n) - A185117(n).
%o A185016 (Python)
%o A185016 def A185016(n): return int(n==6) # _Chai Wah Wu_, Feb 04 2022
%Y A185016 Characteristic function of g: A000007 (g=0), A063524 (g=1), A185012 (g=2), A185013 (g=3), A185014 (g=4), A185015 (g=5), this sequence (g=6), A185017 (g=7).
%K A185016 nonn,easy
%O A185016 0,1
%A A185016 _Jason Kimberley_, Sep 30 2011

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