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 | 4 |
| 2 | 5 |
| 3 | 14 |
| 4 | 42 |
| 5 | 145 |
| 6 | 566 |
| 7 | 2446 |
| 8 | 11547 |
| 9 | 58980 |
| 10 | 323458 |
| 11 | 1892559 |
| 12 | 11751904 |
| 13 | 77101510 |
| 14 | 532426225 |
| 15 | 3857129474 |
| 16 | 29229557534 |
| 17 | 231113610537 |
| 18 | 1902340920682 |
| 19 | 16267763481746 |
| 20 | 144260854186939 |
| 21 | 1324431903156744 |
| 22 | 12569419869410886 |
| 23 | 123141802554934015 |
| 24 | 1243798055506236156 |