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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A280777 Denominators of coefficients in asymptotic expansion of C_n (number of connected chord diagrams, A000699).

Table of values

n a(n)
0 1
1 2
2 8
3 16
4 128
5 1280
6 3072
7 215040
8 3440640
9 2293760
10 137625600
11 201850880
12 72666316800
13 1889324236800
14 52901078630400
15 176336928768000
16 135426761293824
17 191854578499584000
18 1593868805996544000
19 787371190162292736000
20 31494847606491709440000
21 29395191099392262144000

List of values

[1, 2, 8, 16, 128, 1280, 3072, 215040, 3440640, 2293760, 137625600, 201850880, 72666316800, 1889324236800, 52901078630400, 176336928768000, 135426761293824, 191854578499584000, 1593868805996544000, 787371190162292736000, 31494847606491709440000, 29395191099392262144000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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