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 | 6 |
| 4 | 21 |
| 5 | 27 |
| 6 | 42 |
| 7 | 405 |
| 8 | 2304 |
| 9 | 88263 |
| 10 | 88263 |
| 11 | 861993 |
| 12 | 6100974 |
| 13 | 80207226 |
| 14 | 219287178 |
| 15 | 8634767031 |
| 16 | 88898722902 |
| 17 | 690824786553 |
| 18 | 8275073732046 |
| 19 | 238804001546121 |
| 20 | 466718002092342 |
| 21 | 4490717124909015 |
| 22 | 867067777270004211 |
| 23 | 4667948883761025852 |
| 24 | 48958903334001211551 |