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 | 7 |
| 2 | 70 |
| 3 | 721 |
| 4 | 7042 |
| 5 | 67592 |
| 6 | 636517 |
| 7 | 5904746 |
| 8 | 54072137 |
| 9 | 489655873 |
| 10 | 4390760297 |
| 11 | 39030158111 |
| 12 | 344244293260 |
| 13 | 3014869505704 |
| 14 | 26235190722937 |
| 15 | 226961433002801 |
| 16 | 1952889252127030 |
| 17 | 16720135949099562 |
| 18 | 142493658202081151 |
| 19 | 1209158776638832488 |
| 20 | 10219419639669800154 |