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 | 5 |
| 2 | 5 |
| 3 | 13 |
| 4 | 31 |
| 5 | 78 |
| 6 | 207 |
| 7 | 516 |
| 8 | 1288 |
| 9 | 3270 |
| 10 | 8271 |
| 11 | 20866 |
| 12 | 52679 |
| 13 | 133064 |
| 14 | 336062 |
| 15 | 848616 |
| 16 | 2143101 |
| 17 | 5412264 |
| 18 | 13667874 |
| 19 | 34516655 |
| 20 | 87168177 |
| 21 | 220132818 |
| 22 | 555919912 |
| 23 | 1403912579 |
| 24 | 3545419471 |
| 25 | 8953548234 |
| 26 | 22611157039 |
| 27 | 57101877461 |
| 28 | 144204222586 |