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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 23 |
| 8 | 59 |
| 9 | 148 |
| 10 | 385 |
| 11 | 1006 |
| 12 | 2678 |
| 13 | 7170 |
| 14 | 19421 |
| 15 | 52933 |
| 16 | 145364 |
| 17 | 401421 |
| 18 | 1114713 |
| 19 | 3109710 |
| 20 | 8713076 |
| 21 | 24506121 |
| 22 | 69168705 |
| 23 | 195849114 |
| 24 | 556165311 |
| 25 | 1583601840 |
| 26 | 4520226558 |
| 27 | 12931917204 |
| 28 | 37075154703 |