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.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 15 |
| 5 | 44 |
| 6 | 169 |
| 7 | 652 |
| 8 | 3106 |
| 9 | 15286 |
| 10 | 89933 |
| 11 | 532476 |
| 12 | 3698650 |
| 13 | 25749335 |
| 14 | 204947216 |
| 15 | 1636097441 |
| 16 | 14693641859 |
| 17 | 132055603656 |
| 18 | 1319433514898 |
| 19 | 13186485900967 |
| 20 | 144978145009105 |
| 21 | 1594375302986404 |
| 22 | 19128405558986057 |
| 23 | 229508085926717076 |
| 24 | 2983342885319348522 |