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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 39 |
| 6 | 110 |
| 7 | 252 |
| 8 | 465 |
| 9 | 1001 |
| 10 | 9545 |
| 11 | 27634 |
| 12 | 136168 |
| 13 | 589394 |
| 14 | 398959 |
| 15 | 5394991 |
| 16 | 36568060 |
| 17 | 130087267 |
| 18 | 312129649 |
| 19 | 5779594018 |
| 20 | 5467464369 |
| 21 | 69204258903 |
| 22 | 186055048882 |
| 23 | 403978495031 |
| 24 | 8690849042711 |
| 25 | 25668568633102 |
| 26 | 246378923308185 |
| 27 | 1163579759684330 |