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A287154 Number of simple disconnected integral graphs on n vertices. 2
0, 1, 2, 4, 7, 14, 26, 49, 97, 186, 379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..11.

Eric Weisstein's World of Mathematics, Disconnected Graph

Eric Weisstein's World of Mathematics, Integral Graph

FORMULA

a(n) = A077027(n) - A064731(n).

CROSSREFS

Cf. A077027 (number of simple not necessarily connected integral graphs).

Cf. A064731 (number of simple connected integral graphs).

Sequence in context: A253511 A076739 A017996 * A024502 A280254 A280917

Adjacent sequences:  A287151 A287152 A287153 * A287155 A287156 A287157

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, May 20 2017

STATUS

approved

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Last modified October 1 04:06 EDT 2020. Contains 337441 sequences. (Running on oeis4.)