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 | 20 |
| 2 | 269 |
| 3 | 3040 |
| 4 | 31161 |
| 5 | 300300 |
| 6 | 2775109 |
| 7 | 24887960 |
| 8 | 218303921 |
| 9 | 1882786180 |
| 10 | 16026538749 |
| 11 | 135010883280 |
| 12 | 1127921219881 |
| 13 | 9359429537660 |
| 14 | 77233958267189 |
| 15 | 634411837477000 |
| 16 | 5191228487083041 |
| 17 | 42342127346986740 |