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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 21 |
| 6 | 51 |
| 7 | 126 |
| 8 | 316 |
| 9 | 799 |
| 10 | 2034 |
| 11 | 5202 |
| 12 | 13357 |
| 13 | 34407 |
| 14 | 88888 |
| 15 | 230237 |
| 16 | 597829 |
| 17 | 1555962 |
| 18 | 4058944 |
| 19 | 10612102 |
| 20 | 27807135 |
| 21 | 73025751 |
| 22 | 192204957 |
| 23 | 507025163 |
| 24 | 1340545113 |
| 25 | 3552492126 |