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 | 2 |
| 4 | 16 |
| 5 | 76 |
| 6 | 261 |
| 7 | 757 |
| 8 | 2003 |
| 9 | 5035 |
| 10 | 12286 |
| 11 | 29426 |
| 12 | 69554 |
| 13 | 162670 |
| 14 | 376923 |
| 15 | 865971 |
| 16 | 1973941 |
| 17 | 4466853 |
| 18 | 10040524 |
| 19 | 22430584 |
| 20 | 49829116 |
| 21 | 110127536 |
| 22 | 242254321 |
| 23 | 530619937 |
| 24 | 1157676711 |
| 25 | 2516640751 |
| 26 | 5452664426 |
| 27 | 11777687182 |
| 28 | 25367246038 |
| 29 | 54492508610 |
| 30 | 116769551831 |