A232226 a(n) = number of crossing connected diagrams in a disk having n crossings.

1, 8, 83, 911, 10657, 129651, 1625757

Offset

1,2

Links

Table of n, a(n) for n=1..7.

V. Pilaud and J. Rué, Analytic combinatorics of chord and hyperchord diagrams with k crossings, arXiv preprint arXiv:1307.6440 [math.CO], 2013.

Crossrefs

Row sums of A232225 and A232227.

Sequence in context: A196715 A179980 A236671 * A238811 A307829 A039939

Adjacent sequences: A232223 A232224 A232225 * A232227 A232228 A232229

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 22 2013

Status

approved