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.

A067647 Number of knot diagrams of type 1PI with n crossings and two outgoing strings.

Table of values

n a(n)
0 0
1 2
2 4
3 18
4 108
5 748
6 5648
7 45234
8 378300
9 3271204
10 29049824
11 263656356
12 2436827328
13 22871937208
14 217536523260
15 2092958991474
16 20341256951692
17 199471121367508
18 1971730006936240
19 19630246152650228

List of values

[0, 2, 4, 18, 108, 748, 5648, 45234, 378300, 3271204, 29049824, 263656356, 2436827328, 22871937208, 217536523260, 2092958991474, 20341256951692, 199471121367508, 1971730006936240, 19630246152650228]

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

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