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 | 3 |
| 3 | 9 |
| 4 | 19 |
| 5 | 82 |
| 6 | 229 |
| 7 | 1313 |
| 8 | 4581 |
| 9 | 32826 |
| 10 | 137431 |
| 11 | 1181737 |
| 12 | 5772103 |
| 13 | 57905114 |
| 14 | 323237769 |
| 15 | 3705927297 |
| 16 | 23273119369 |
| 17 | 300180111058 |
| 18 | 2094580743211 |
| 19 | 30018011105801 |
| 20 | 230403881753211 |
| 21 | 3632179343801922 |
| 22 | 30413312391423853 |
| 23 | 523033825507476769 |
| 24 | 4744476733062121069 |
| 25 | 88392716510763573962 |