A297671 Number of chordless cycles in the n-triangular grid graph.

0, 0, 0, 1, 7, 41, 260, 1930, 17463, 200008, 3026192, 62212319, 1742874972, 65794989216, 3314857545154, 222226981778153, 19858056830333695, 2371636836808937036, 378993965527624639893

Offset

0,5

Links

Table of n, a(n) for n=0..18.

Eric Weisstein's World of Mathematics, Chordless Cycle

Eric Weisstein's World of Mathematics, Triangular Grid Graph

Crossrefs

Cf. A112676, A266513.

Sequence in context: A036730 A258941 A080047 * A356298 A125120 A353992

Adjacent sequences: A297668 A297669 A297670 * A297672 A297673 A297674

Keyword

nonn,more

Author

Eric W. Weisstein, Jan 02 2018

Extensions

a(7)-a(18) from Andrew Howroyd, Jan 08 2018

Status

approved