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A185014 Characteristic function of four. 15
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, 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Number of connected 2-regular (simple) graphs with girth exactly 4.

The Euler transformation of this sequence is A121262.

LINKS

Table of n, a(n) for n=0..85.

FORMULA

a(n) = A185114(n) - A185115(n).

CROSSREFS

Characteristic function of g: A000007 (g=0), A063524 (g=1), A185012 (g=2), A185013 (g=3), this sequence (g=4), A185015 (g=5), A185016 (g=6), A185017 (g=7).

Sequence in context: A178334 A185016 A185015 * A185013 A185012 A185017

Adjacent sequences:  A185011 A185012 A185013 * A185015 A185016 A185017

KEYWORD

nonn,easy

AUTHOR

Jason Kimberley, Sep 30 2011

STATUS

approved

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Last modified February 26 12:43 EST 2020. Contains 332280 sequences. (Running on oeis4.)