1,3

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

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

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

nonn

Eric W. Weisstein, May 20 2017

approved