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 | 8 |
| 2 | 28 |
| 3 | 172 |
| 4 | 1231 |
| 5 | 9588 |
| 6 | 78543 |
| 7 | 665140 |
| 8 | 5768004 |
| 9 | 50917519 |
| 10 | 455743004 |
| 11 | 4124599869 |
| 12 | 37668527415 |
| 13 | 346621096885 |
| 14 | 3210012022164 |
| 15 | 29890794226982 |
| 16 | 279660033612131 |
| 17 | 2627410589445923 |
| 18 | 24775244142175635 |
| 19 | 234381646366460804 |