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.

A226013 Number of unimodal functions f:[n]->[2n] with f(1)<>1 and f(i)<>f(i+1).

Table of values

n a(n)
0 1
1 1
2 9
3 70
4 581
5 4956
6 43065
7 379093
8 3369301
9 30168268
10 271716644
11 2459014504
12 22342432139
13 203682343840
14 1862165051700
15 17066961406095
16 156758478514005
17 1442549386731900
18 13297258924349292
19 122757267172891048
20 1134800963513922996
21 10503230892143398192

List of values

[1, 1, 9, 70, 581, 4956, 43065, 379093, 3369301, 30168268, 271716644, 2459014504, 22342432139, 203682343840, 1862165051700, 17066961406095, 156758478514005, 1442549386731900, 13297258924349292, 122757267172891048, 1134800963513922996, 10503230892143398192]

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

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