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 | 3 |
| 3 | 11 |
| 4 | 30 |
| 5 | 109 |
| 6 | 297 |
| 7 | 1079 |
| 8 | 2940 |
| 9 | 10681 |
| 10 | 29103 |
| 11 | 105731 |
| 12 | 288090 |
| 13 | 1046629 |
| 14 | 2851797 |
| 15 | 10360559 |
| 16 | 28229880 |
| 17 | 102558961 |
| 18 | 279447003 |
| 19 | 1015229051 |
| 20 | 2766240150 |
| 21 | 10049731549 |
| 22 | 27382954497 |
| 23 | 99482086439 |
| 24 | 271063304820 |
| 25 | 984771132841 |