cp's OEIS Frontend

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.

A143023 Sum of the root degrees over all non-crossing connected graphs on n nodes on a circle (by root we mean a distinguished node).

Table of values

n a(n)
2 1
3 6
4 41
5 306
6 2422
7 19980
8 169941
9 1479786
10 13127114
11 118217268
12 1077955034
13 9932655348
14 92342765868
15 865126386072
16 8159523358029
17 77411610053658
18 738263424935170
19 7073522484902820
20 68056887469098990
21 657269559836605980

List of values

[1, 6, 41, 306, 2422, 19980, 169941, 1479786, 13127114, 118217268, 1077955034, 9932655348, 92342765868, 865126386072, 8159523358029, 77411610053658, 738263424935170, 7073522484902820, 68056887469098990, 657269559836605980]

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

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