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 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 50 |
| 4 | 148 |
| 5 | 393 |
| 6 | 993 |
| 7 | 2450 |
| 8 | 5976 |
| 9 | 14497 |
| 10 | 35077 |
| 11 | 84770 |
| 12 | 204748 |
| 13 | 494409 |
| 14 | 1193721 |
| 15 | 2882018 |
| 16 | 6957936 |
| 17 | 16798081 |
| 18 | 40554301 |
| 19 | 97906898 |
| 20 | 236368324 |
| 21 | 570643785 |
| 22 | 1377656145 |
| 23 | 3325956338 |
| 24 | 8029569096 |
| 25 | 19385094817 |