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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 46 |
| 5 | 511 |
| 6 | 1619 |
| 7 | 78881 |
| 8 | 81404 |
| 9 | 81619 |
| 10 | 161761 |
| 11 | 1105046 |
| 12 | 1456404 |
| 13 | 4595881 |
| 14 | 814010204 |
| 15 | 128884685369 |
| 16 | 112366637002369 |
| 17 | 47130268582155593596 |
| 18 | 51595698572871617009432954 |