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) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 38 |
| 6 | 153 |
| 7 | 766 |
| 8 | 6259 |
| 9 | 88064 |
| 10 | 2324157 |
| 11 | 116563882 |
| 12 | 11060411527 |
| 13 | 1968703079886 |
| 14 | 654492092481733 |
| 15 | 406111248305672980 |
| 16 | 471005105043787823717 |
| 17 | 1023566652048387537072658 |
| 18 | 4179937690541808658135640875 |
| 19 | 32172436158252943170541450460638 |