A288722 Number of connected (non-null) inducted subgraphs in the n-triangular grid graph.

1, 7, 47, 492, 10030, 415504, 34821705, 5873737591, 1986293769719, 1342287826603144, 1808263364071413240, 4847274244238104590520, 25819608749278516743821755, 272991106439478141199607596649, 5724287949499035173796596544768241, 237885203520333624684917852305536258876

Offset: 1

Author

Eric W. Weisstein, Jun 14 2017

Keywords

• nonn
• changed

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..20
• Eric Weisstein's World of Mathematics, Triangular Grid Graph
• Eric Weisstein's World of Mathematics, Vertex-Induced Subgraph

Crossrefs

Cf. A288721.

Extensions

a(8) onwards from Andrew Howroyd, Aug 15 2017