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 | 3 |
| 2 | 19 |
| 3 | 22 |
| 4 | 85 |
| 5 | 447 |
| 6 | 1873 |
| 7 | 41653 |
| 8 | 43526 |
| 9 | 85179 |
| 10 | 384242 |
| 11 | 469421 |
| 12 | 1323084 |
| 13 | 111608477 |
| 14 | 112931561 |
| 15 | 450403160 |
| 16 | 563334721 |
| 17 | 3830411486 |
| 18 | 4393746207 |
| 19 | 17011650107 |
| 20 | 21405396314 |
| 21 | 209660216933 |
| 22 | 231065613247 |
| 23 | 440725830180 |
| 24 | 671791443427 |
| 25 | 1112517273607 |
| 26 | 21809619641960 |
| 27 | 66541376199487 |