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A076434 Number of weakly regular simple graphs on n nodes. 3
0, 0, 0, 0, 0, 2, 4, 16, 21, 168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..10.

Eric Weisstein's World of Mathematics, Weakly Regular Graph

FORMULA

a(n) = A005176(n) - A076435(n). - Andrew Howroyd, Sep 03 2019

CROSSREFS

Cf. A005176 (regular simple graphs on n nodes).

Cf. A294405 (connected weakly regular graphs on n nodes).

Cf. A076435 (strongly regular simple graphs on n nodes).

Sequence in context: A045521 A338766 A242205 * A192150 A049441 A253143

Adjacent sequences:  A076431 A076432 A076433 * A076435 A076436 A076437

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Oct 11 2002

EXTENSIONS

a(10) from Eric W. Weisstein, Oct 30 2017

STATUS

approved

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Last modified June 21 01:12 EDT 2021. Contains 345339 sequences. (Running on oeis4.)