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 | 5 |
| 3 | 22 |
| 4 | 125 |
| 5 | 836 |
| 6 | 6277 |
| 7 | 52396 |
| 8 | 479593 |
| 9 | 4757680 |
| 10 | 50738921 |
| 11 | 577894604 |
| 12 | 6990138685 |
| 13 | 89376020800 |
| 14 | 1203182518189 |
| 15 | 16995248375116 |
| 16 | 251135780602193 |
| 17 | 3871961504546624 |
| 18 | 62141329025501905 |
| 19 | 1035979079450355532 |
| 20 | 17907209511611407141 |
| 21 | 320387246623657457056 |
| 22 | 5924125441456047522005 |