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 | 2 |
| 3 | 7 |
| 4 | 24 |
| 5 | 79 |
| 6 | 258 |
| 7 | 851 |
| 8 | 2852 |
| 9 | 9715 |
| 10 | 33582 |
| 11 | 117561 |
| 12 | 416012 |
| 13 | 1485787 |
| 14 | 5348866 |
| 15 | 19389675 |
| 16 | 70715324 |
| 17 | 259289563 |
| 18 | 955277382 |
| 19 | 3534526361 |
| 20 | 13128240820 |
| 21 | 48932534019 |
| 22 | 182965127258 |
| 23 | 686119227277 |
| 24 | 2579808294624 |
| 25 | 9723892802879 |
| 26 | 36734706144278 |
| 27 | 139067101831981 |