A293249 Number of matchings in the n-triangular honeycomb bishop graph.

1, 3, 24, 624, 58258, 21423356, 33352210384, 234271975272172, 7849205797114197704, 1318509837007765330964948, 1161589241831987552884873549832, 5592410686612429649991093735982825800, 152814054664056604403587836700924195641924920

Offset

1,2

Comments

C# software that can be used to compute this sequence can be found in A270228 (with rook column heights of 1..n). - Andrew Howroyd, Oct 04 2017

Links

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

Eric Weisstein's World of Mathematics, Independent Edge Set

Eric Weisstein's World of Mathematics, Matching

Crossrefs

Cf. A270228.

Sequence in context: A109055 A318766 A292813 * A202944 A056207 A297561

Adjacent sequences: A293246 A293247 A293248 * A293250 A293251 A293252

Keyword

nonn

Author

Eric W. Weisstein, Oct 03 2017

Extensions

a(8)-a(13) from Andrew Howroyd, Oct 04 2017

Status

approved