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 | 7 |
| 3 | 22 |
| 4 | 83 |
| 5 | 301 |
| 6 | 1079 |
| 7 | 4064 |
| 8 | 15183 |
| 9 | 55012 |
| 10 | 207349 |
| 11 | 770421 |
| 12 | 2830250 |
| 13 | 10617371 |
| 14 | 39400644 |
| 15 | 145704104 |
| 16 | 544623685 |
| 17 | 2020998479 |
| 18 | 7497256552 |
| 19 | 27957348859 |
| 20 | 103787074017 |
| 21 | 385563034716 |
| 22 | 1435728019366 |
| 23 | 5332352333196 |
| 24 | 19821039046245 |