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 | 5 |
| 2 | 24 |
| 3 | 113 |
| 4 | 527 |
| 5 | 2446 |
| 6 | 11325 |
| 7 | 52369 |
| 8 | 242008 |
| 9 | 1117997 |
| 10 | 5163891 |
| 11 | 23849270 |
| 12 | 110142089 |
| 13 | 508652653 |
| 14 | 2349005592 |
| 15 | 10847859961 |
| 16 | 50095958215 |
| 17 | 231345247934 |
| 18 | 1068361195173 |
| 19 | 4933730638937 |
| 20 | 22784141325656 |
| 21 | 105217952251285 |
| 22 | 485900111176779 |
| 23 | 2243903303473318 |