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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 27 |
| 5 | 91 |
| 6 | 483 |
| 7 | 2227 |
| 8 | 15627 |
| 9 | 92491 |
| 10 | 810963 |
| 11 | 5866147 |
| 12 | 61720827 |
| 13 | 527635291 |
| 14 | 6476783043 |
| 15 | 63886537267 |
| 16 | 896245131627 |
| 17 | 10019232896491 |
| 18 | 158126425788723 |
| 19 | 1975680877259587 |
| 20 | 34645295464104027 |
| 21 | 478434297205284091 |
| 22 | 9228741116739540003 |
| 23 | 139581878985127217107 |