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 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 76 |
| 5 | 251 |
| 6 | 829 |
| 7 | 2738 |
| 8 | 9043 |
| 9 | 29867 |
| 10 | 98644 |
| 11 | 325799 |
| 12 | 1076041 |
| 13 | 3553922 |
| 14 | 11737807 |
| 15 | 38767343 |
| 16 | 128039836 |
| 17 | 422886851 |
| 18 | 1396700389 |
| 19 | 4612988018 |
| 20 | 15235664443 |
| 21 | 50319981347 |
| 22 | 166195608484 |
| 23 | 548906806799 |
| 24 | 1812916028881 |