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 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 51 |
| 5 | 171 |
| 6 | 745 |
| 7 | 1057 |
| 8 | 3507 |
| 9 | 23205 |
| 10 | 50779 |
| 11 | 51475 |
| 12 | 97113 |
| 13 | 241887 |
| 14 | 593727 |
| 15 | 636291 |
| 16 | 1661215 |
| 17 | 6010095 |
| 18 | 6100953 |
| 19 | 8825911 |
| 20 | 22032619 |
| 21 | 24058237 |
| 22 | 71730273 |
| 23 | 84577003 |
| 24 | 98797723 |
| 25 | 119871675 |
| 26 | 255510487 |
| 27 | 380154649 |
| 28 | 404917765 |
| 29 | 704823889 |
| 30 | 910302427 |
| 31 | 1696449051 |
| 32 | 2565189555 |
| 33 | 9024827079 |