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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 18 |
| 6 | 21 |
| 7 | 84 |
| 8 | 88 |
| 9 | 440 |
| 10 | 445 |
| 11 | 2670 |
| 12 | 2676 |
| 13 | 18732 |
| 14 | 18739 |
| 15 | 149912 |
| 16 | 149920 |
| 17 | 1349280 |
| 18 | 1349289 |
| 19 | 13492890 |
| 20 | 13492900 |
| 21 | 148421900 |
| 22 | 148421911 |
| 23 | 1781062932 |
| 24 | 1781062944 |
| 25 | 23153818272 |
| 26 | 23153818285 |
| 27 | 324153455990 |
| 28 | 324153456004 |
| 29 | 4862301840060 |
| 30 | 4862301840075 |
| 31 | 77796829441200 |