A173758 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A173758

Partial sums of A006820.

0

1, 1, 1, 1, 1, 2, 3, 5, 11, 27, 86, 351, 1895, 12673, 100841, 906332, 8943750, 95165384, 1081035906, 13027523553, 165835586734, 2222527601208, 31273800434817, 460941981112256, 7101107185967292, 114127691657536897, 1910229280483131905, 33244227211086415436

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,6

COMMENTS

Number of connected quartic graphs with at most n nodes.

LINKS

Table of n, a(n) for n=0..27.

FORMULA

a(n) = Sum_{k=0..n} A006820(k). [corrected by Georg Fischer, Sep 28 2021]

CROSSREFS

Cf. A006820, A033301, A033483.

Connected regular graphs of degree k: A002851 (k=3), A006820 (k=4), A006821 (k=5), A006822 (k=6), A014377 (k=7), A014378 (k=8), A014381 (k=9), A014382 (k=10), A014384 (k=11).

Sequence in context: A009589 A098179 A055228 * A098642 A079447 A171832

Adjacent sequences: A173755 A173756 A173757 * A173759 A173760 A173761

KEYWORD

nonn

AUTHOR

Jonathan Vos Post, Feb 23 2010

EXTENSIONS

Corrected by Jason Kimberley, Mar 29 2010

STATUS

approved