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.

A110886 Number of signed weighted Euler trees with total weight n (associated to even switching classes of matrices of order 2n).

Table of values

n a(n)
0 1
1 1
2 3
3 8
4 27
5 104
6 436
7 1930
8 8871
9 41916
10 202300
11 992942
12 4940912
13 24867870
14 126371426
15 647494746
16 3341341155
17 17350565376
18 90593056624
19 475333630402
20 2504959102224
21 13252904123786
22 70366654738470
23 374824160997086

List of values

[1, 1, 3, 8, 27, 104, 436, 1930, 8871, 41916, 202300, 992942, 4940912, 24867870, 126371426, 647494746, 3341341155, 17350565376, 90593056624, 475333630402, 2504959102224, 13252904123786, 70366654738470, 374824160997086]

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

Content is available under The OEIS End-User License Agreement.