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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 17 |
| 6 | 51 |
| 7 | 163 |
| 8 | 561 |
| 9 | 2004 |
| 10 | 7391 |
| 11 | 27873 |
| 12 | 107050 |
| 13 | 417152 |
| 14 | 1645339 |
| 15 | 6555752 |
| 16 | 26348334 |
| 17 | 106691779 |
| 18 | 434851380 |
| 19 | 1782551286 |
| 20 | 7344326285 |
| 21 | 30397197514 |
| 22 | 126324028956 |
| 23 | 526911437207 |
| 24 | 2205163133586 |
| 25 | 9256931835831 |
| 26 | 38967696710845 |