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 | 2 |
| 2 | 3 |
| 3 | 12 |
| 4 | 41 |
| 5 | 139 |
| 6 | 442 |
| 7 | 1349 |
| 8 | 4093 |
| 9 | 12108 |
| 10 | 35153 |
| 11 | 101295 |
| 12 | 289048 |
| 13 | 819477 |
| 14 | 2309689 |
| 15 | 6472406 |
| 16 | 18054351 |
| 17 | 50153807 |
| 18 | 138847614 |
| 19 | 383282511 |
| 20 | 1054875523 |
| 21 | 2895955030 |
| 22 | 7931352725 |
| 23 | 21678032713 |
| 24 | 59142462326 |
| 25 | 161068803147 |
| 26 | 437935857313 |
| 27 | 1188967702870 |
| 28 | 3223626641605 |
| 29 | 8729120815845 |
| 30 | 23609318259832 |