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

1,2

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.

Sequence in context: A218761 A173772 A178002 * A006873 A228695 A368295

Adjacent sequences: A288719 A288720 A288721 * A288723 A288724 A288725

Keyword

nonn

Author

Eric W. Weisstein, Jun 14 2017

Extensions

a(8)-a(16) from Andrew Howroyd, Aug 15 2017

Status

approved