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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 55 |
| 10 | 306 |
| 11 | 1145 |
| 12 | 3454 |
| 13 | 8997 |
| 14 | 21008 |
| 15 | 45031 |
| 16 | 630421 |
| 17 | 5954062 |
| 18 | 36439007 |
| 19 | 174011100 |
| 20 | 697278853 |
| 21 | 2442137774 |
| 22 | 7677528495 |
| 23 | 154507257827 |
| 24 | 2060124800270 |
| 25 | 17511127577941 |
| 26 | 114431145225190 |
| 27 | 619024078342189 |
| 28 | 2890746049056048 |
| 29 | 11979440405949527 |