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 | 5 |
| 4 | 7 |
| 5 | 12 |
| 6 | 247 |
| 7 | 259 |
| 8 | 506 |
| 9 | 1271 |
| 10 | 1777 |
| 11 | 3048 |
| 12 | 62737 |
| 13 | 65785 |
| 14 | 128522 |
| 15 | 322829 |
| 16 | 451351 |
| 17 | 774180 |
| 18 | 15934951 |
| 19 | 16709131 |
| 20 | 32644082 |
| 21 | 81997295 |
| 22 | 114641377 |
| 23 | 196638672 |
| 24 | 4047414817 |
| 25 | 4244053489 |
| 26 | 8291468306 |
| 27 | 20826990101 |