A297387 Number of Eulerian cycles in the n-triangular grid graph.

1, 16, 4032, 15240192, 851527696384, 698020036891115520, 8357968487643562314301440, 1457789983634180266210347100143616, 3696916888496244614672984462362519120379904, 136132525681108593648158474136309868068849288394833920

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Eric Weisstein's World of Mathematics, Eulerian Cycle.

Eric Weisstein's World of Mathematics, Triangular Grid Graph.

Crossrefs

Cf. A334555.

Sequence in context: A367535 A222917 A060616 * A016936 A321242 A013721

Adjacent sequences: A297384 A297385 A297386 * A297388 A297389 A297390

Keyword

nonn

Author

Eric W. Weisstein, Dec 29 2017

Extensions

a(5)-a(9) from Andrew Howroyd, Jan 11 2018

a(10) from Andrew Howroyd, Feb 18 2024

Status

approved