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 | 4 |
| 3 | 14 |
| 4 | 62 |
| 5 | 272 |
| 6 | 1307 |
| 7 | 6178 |
| 8 | 28687 |
| 9 | 127074 |
| 10 | 534414 |
| 11 | 2125086 |
| 12 | 8003063 |
| 13 | 28603253 |
| 14 | 97334199 |
| 15 | 316359888 |
| 16 | 985253099 |
| 17 | 2948785272 |
| 18 | 8504664978 |
| 19 | 23695762074 |
| 20 | 63924853698 |
| 21 | 167320196102 |
| 22 | 425715789486 |
| 23 | 1054686008982 |