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 | 6 |
| 2 | 51 |
| 3 | 546 |
| 4 | 6906 |
| 5 | 99156 |
| 6 | 1573011 |
| 7 | 27045906 |
| 8 | 496875786 |
| 9 | 9648849516 |
| 10 | 196398517266 |
| 11 | 4162468827996 |
| 12 | 91368155193516 |
| 13 | 2068136816127336 |
| 14 | 48099850263089271 |
| 15 | 1146002911372510146 |
| 16 | 27900188933013974226 |
| 17 | 692586162911883821196 |
| 18 | 17497841261192358474126 |
| 19 | 449207277104544688505556 |