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 | 539 |
| 3 | 560 |
| 4 | 1803 |
| 5 | 4740 |
| 6 | 4859 |
| 7 | 12020 |
| 8 | 29103 |
| 9 | 29796 |
| 10 | 71519 |
| 11 | 171080 |
| 12 | 175119 |
| 13 | 418296 |
| 14 | 998579 |
| 15 | 1022120 |
| 16 | 2439459 |
| 17 | 5821596 |
| 18 | 5958803 |
| 19 | 14219660 |
| 20 | 33932199 |
| 21 | 34731900 |
| 22 | 82879703 |
| 23 | 197772800 |
| 24 | 202433799 |
| 25 | 483059760 |
| 26 | 1152705803 |
| 27 | 1179872096 |