A295190 Chromatic invariant of the n-triangular grid graph.

1, 1, 1, 5, 97, 6739, 1611097, 1295101469, 3449859538455, 30155591559236245, 859063676925680110319, 79361177641450830904290293

Offset

0,4

Links

Table of n, a(n) for n=0..11.

Eric Weisstein's World of Mathematics, Chromatic Invariant

Eric Weisstein's World of Mathematics, Triangular Grid Graph

Crossrefs

Cf. A182283, A182797, A193283.

Sequence in context: A350516 A342443 A117341 * A202516 A062538 A350874

Adjacent sequences: A295187 A295188 A295189 * A295191 A295192 A295193

Keyword

nonn,more

Author

Eric W. Weisstein, Nov 16 2017

Extensions

a(8)-a(11) from Andrew Howroyd, Apr 23 2018

Status

approved