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.

A030983 Number of rooted noncrossing trees with n nodes such that root has degree 1 and the child of the root has degree at least 2.

Table of values

n a(n)
3 0
4 3
5 16
6 83
7 442
8 2420
9 13566
10 77539
11 450340
12 2650635
13 15777450
14 94815732
15 574518536
16 3506232184
17 21533144486
18 132980242755
19 825304177544
20 5144743785545
21 32199189658020
22 202252227085755
23 1274578959894450
24 8056409137803600
25 51063344718826440

List of values

[0, 3, 16, 83, 442, 2420, 13566, 77539, 450340, 2650635, 15777450, 94815732, 574518536, 3506232184, 21533144486, 132980242755, 825304177544, 5144743785545, 32199189658020, 202252227085755, 1274578959894450, 8056409137803600, 51063344718826440]

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

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