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 | 3 |
| 2 | 15 |
| 3 | 112 |
| 4 | 1128 |
| 5 | 14373 |
| 6 | 221952 |
| 7 | 4029915 |
| 8 | 84135510 |
| 9 | 1985740905 |
| 10 | 52277994396 |
| 11 | 1518768476508 |
| 12 | 48261093246396 |
| 13 | 1665034362336120 |
| 14 | 61979166611850084 |
| 15 | 2475861386988907814 |
| 16 | 105641851808320785498 |
| 17 | 4795101548183135826810 |