A362514 Number of odd chordless cycles of length >4 in the n-triangular grid graph.

0, 0, 0, 1, 13, 115, 959, 8876, 101123, 1519504, 31138405, 871560677, 32897263307, 1657411773700, 111113100638331, 9929019852558612, 1185818207579540160, 189496976724420953109, 40497113442395855810240, 11561238705271610991734848

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, Odd Chordless Cycle

Eric Weisstein's World of Mathematics, Triangular Grid Graph

Crossrefs

Cf. A297671.

Sequence in context: A156969 A287471 A016765 * A115188 A155621 A232319

Adjacent sequences: A362511 A362512 A362513 * A362515 A362516 A362517

Keyword

nonn

Author

Eric W. Weisstein, Apr 23 2023

Extensions

a(11)-a(20) from Andrew Howroyd, Apr 23 2023

Status

approved