A347724 Number of irredundant sets in the n-triangular grid graph.

2, 4, 17, 102, 925, 12508, 274369, 8955595, 447311286, 34069625935, 3993234239468

Offset

0,1

Links

Table of n, a(n) for n=0..10.

Eric Weisstein's World of Mathematics, Irredundant Set

Eric Weisstein's World of Mathematics, Triangular Grid Graph

Crossrefs

Cf. A346143, A347639.

Sequence in context: A212581 A305786 A009319 * A009323 A307125 A247260

Adjacent sequences: A347721 A347722 A347723 * A347725 A347726 A347727

Keyword

nonn,more

Author

Eric W. Weisstein, Sep 11 2021

Extensions

Missing a(0) inserted and a(7)-a(10) from Andrew Howroyd, Jan 19 2022

Status

approved