login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A093376 Number of labeled n-vertex graphs with 2-components and without isolated vertices(1-components). 0
0, 0, 1, 0, 3, 40, 585, 15708, 760277, 67656960, 11346344145, 3648840170580, 2277220167519825, 2780207051899228224, 6675377730807161508041, 31633731603265107184483860, 296598264243770222308892404305 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..16.

FORMULA

E.g.f. exp(-x)*(1-exp(-x^2/2))*Sum(2^binomial(n, 2)*x^n/n!, n=0..infinity). Inverse binomial transform of A093351().

CROSSREFS

Cf. A006129, A093351, A093352.

Sequence in context: A220639 A005724 A215196 * A051571 A019654 A156356

Adjacent sequences:  A093373 A093374 A093375 * A093377 A093378 A093379

KEYWORD

nonn

AUTHOR

Goran Kilibarda, Vladeta Jovovic, Apr 28 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 04:04 EDT 2019. Contains 322329 sequences. (Running on oeis4.)