A391918 Number of irredundant sets in the n-triangular honeycomb acute knight graph.

2, 8, 27, 144, 1331, 27000, 569344, 16777216, 1083206683, 85307250648, 9197641041408, 1896999488202671, 567844742926891708

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Eric Weisstein's World of Mathematics, Irredundant Set.

Eric Weisstein's World of Mathematics, Triangular Honeycomb Acute Knight Graph.

Crossrefs

Sequence in context: A383974 A276940 A287204 * A299640 A197932 A170871

Adjacent sequences: A391915 A391916 A391917 * A391919 A391920 A391921

Keyword

nonn,more

Author

Eric W. Weisstein, Dec 23 2025

Status

approved