A052450 Number of n-node simple graphs having clique number 2.

0, 1, 2, 6, 13, 37, 106, 409, 1896, 12171, 105070, 1262179, 20797001, 467871368, 14232552451, 581460254000, 31720840164949

Offset

1,3

Links

Table of n, a(n) for n=1..17.

Keith M. Briggs, Combinatorial Graph Theory

Eric Weisstein's World of Mathematics, Clique Number.

Crossrefs

Cf. A052451, A052452, A052453, A077392, A077393, A077394.

a(n) = A006785(n) - 1. - Falk Hüffner, Nov 20 2015

Sequence in context: A026550 A319751 A124124 * A231385 A001373 A320804

Adjacent sequences: A052447 A052448 A052449 * A052451 A052452 A052453

Keyword

nonn,more

Author

Eric W. Weisstein

Extensions

2 more terms from Eric W. Weisstein, Nov 03 2002

a(10) from Keith Briggs, Mar 15 2006

a(11) from Michael Sollami, Jan 29 2012

a(12) from Michael Sollami, Mar 26 2012

More terms added using A006785 by Falk Hüffner, Nov 20 2015

Status

approved