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 | 0 |
| 1 | 1 |
| 2 | 18 |
| 3 | 309 |
| 4 | 5828 |
| 5 | 123230 |
| 6 | 2913126 |
| 7 | 76405854 |
| 8 | 2205340936 |
| 9 | 69523722855 |
| 10 | 2377899710410 |
| 11 | 87721897714891 |
| 12 | 3472488925101516 |
| 13 | 146833416409808492 |
| 14 | 6605726035373765678 |
| 15 | 315051237815279406540 |
| 16 | 15879038919798268666896 |
| 17 | 843348814519524716426685 |