A293963 Number of linear chord diagrams having 2n chords and maximal chord length n, a(0)=1.

1, 1, 10, 300, 18186, 1838508, 278873238, 59240617044, 16785089537034, 6116748053227032, 2787180218661133026, 1552687010566633714620, 1038232662085139704575042, 820642288423711927490012112, 756912885595843667978969686938, 805677646550729982087279165847716

Offset

0,3

Links

Table of n, a(n) for n=0..15.

Formula

a(n) = A293961(2n,n).

Crossrefs

Cf. A293961.

Sequence in context: A278037 A275652 A221953 * A152165 A228188 A041425

Adjacent sequences: A293960 A293961 A293962 * A293964 A293965 A293966

Keyword

nonn

Author

Alois P. Heinz, Oct 20 2017

Status

approved