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 | 5 |
| 3 | 17 |
| 4 | 109 |
| 5 | 706 |
| 6 | 9529 |
| 7 | 149057 |
| 8 | 3464585 |
| 9 | 141172802 |
| 10 | 5987285341 |
| 11 | 540281496721 |
| 12 | 53055650250901 |
| 13 | 8453268527614082 |
| 14 | 2173247123169247025 |
| 15 | 610193552206250342657 |
| 16 | 364280506115937098013649 |
| 17 | 225791960727416355391439746 |