A293998 Number of linear chord diagrams having n chords and no chord length larger than six.
1, 1, 3, 15, 105, 945, 10395, 45045, 222951, 1245257, 7689707, 50548041, 328681355, 1898148921, 10938090235, 64447508901, 388656309623, 2372510073525, 14406809496311, 86092382481933, 512757617989667, 3064484085534721, 18400499270245971, 110741448251269561
Offset: 0
Links
- Alois P. Heinz, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (3, 7, 7, 84, 939, 6095, -4433, -31187, -37164, -140858, -899154, -569580, 741066, 3256828, -1225088, 19146692, -26901488, 28568896, 21503648, -89813600, 175998288, -128442288, 44156064, -18953856, 34648704, 69766272, -7008768, 5868288, -82363392, -80815104, -46448640, -9953280)
Crossrefs
Column k=6 of A293960.