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 | 2 |
| 2 | 7 |
| 3 | 44 |
| 4 | 419 |
| 5 | 5254 |
| 6 | 80687 |
| 7 | 1458524 |
| 8 | 30259147 |
| 9 | 707813762 |
| 10 | 18421139495 |
| 11 | 527856303160 |
| 12 | 16513700403347 |
| 13 | 560082210938174 |
| 14 | 20471657576850655 |
| 15 | 802275966701866964 |
| 16 | 33560323690860843995 |
| 17 | 1492638035099491033402 |