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 | 27 |
| 2 | 377 |
| 3 | 3627 |
| 4 | 27026 |
| 5 | 166230 |
| 6 | 878409 |
| 7 | 4098483 |
| 8 | 17222607 |
| 9 | 66165501 |
| 10 | 235124461 |
| 11 | 780112671 |
| 12 | 2435132466 |
| 13 | 7196829486 |
| 14 | 20245295242 |
| 15 | 54455027238 |
| 16 | 140596223184 |
| 17 | 349621224120 |
| 18 | 839832229131 |
| 19 | 1953829030737 |
| 20 | 4412447681628 |
| 21 | 9693085025844 |
| 22 | 20750619208890 |
| 23 | 43361428085886 |