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A293998 Number of linear chord diagrams having n chords and no chord length larger than six. 2
1, 1, 3, 15, 105, 945, 10395, 45045, 222951, 1245257, 7689707, 50548041, 328681355, 1898148921, 10938090235, 64447508901, 388656309623, 2372510073525, 14406809496311, 86092382481933, 512757617989667, 3064484085534721, 18400499270245971, 110741448251269561 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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.

Sequence in context: A293997 A328866 A247304 * A293999 A294000 A294001

Adjacent sequences:  A293995 A293996 A293997 * A293999 A294000 A294001

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Oct 21 2017

STATUS

approved

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Last modified August 1 07:45 EDT 2021. Contains 346384 sequences. (Running on oeis4.)