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 | 17 |
| 2 | 1713 |
| 3 | 33809 |
| 4 | 306049 |
| 5 | 1733537 |
| 6 | 7259297 |
| 7 | 24499121 |
| 8 | 70554353 |
| 9 | 179773681 |
| 10 | 415055025 |
| 11 | 886597537 |
| 12 | 1773617697 |
| 13 | 3355533537 |
| 14 | 6058457297 |
| 15 | 10510672945 |
| 16 | 17588781393 |
| 17 | 28537047057 |
| 18 | 45040906785 |
| 19 | 69369596001 |
| 20 | 104503770913 |