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A210345 The number of degree sequences of simple graphs with n vertices with all even degrees. 2
1, 1, 2, 3, 7, 14, 36, 74, 201, 425, 1178, 2515, 7063, 15209, 43088, 93382, 266236, 579950, 1661548, 3634062, 10451798, 22935259, 66170288, 145601216, 421164456, 928875440, 2692737120, 5950570725, 17282501978, 38257352346, 111292168834, 246730727752, 718763328317, 1595578916923, 4653944394630 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(2n) = A210346(n). For even n, the complementary sequence has all odd degrees.

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

For n=3, there are only two degree sequences with all even terms are possible: {0,0,0} and {2,2,2}. Thus, a(3)=2.

CROSSREFS

Cf. A210346, A049339

Sequence in context: A113822 A036250 A191491 * A006660 A213906 A123777

Adjacent sequences:  A210342 A210343 A210344 * A210346 A210347 A210348

KEYWORD

nonn

AUTHOR

Tanya Khovanova and Dai Yang, Mar 20 2012

EXTENSIONS

a(13)-a(35) from Robert Gerbicz, Apr 08 2012

STATUS

approved

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Last modified November 20 12:30 EST 2017. Contains 294971 sequences.