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 | 18 |
| 2 | 199 |
| 3 | 2309 |
| 4 | 26660 |
| 5 | 307983 |
| 6 | 3557711 |
| 7 | 41097664 |
| 8 | 474748249 |
| 9 | 5484153915 |
| 10 | 63351353194 |
| 11 | 731816432741 |
| 12 | 8453730886601 |
| 13 | 97655043951558 |
| 14 | 1128082705387895 |
| 15 | 13031283779122753 |
| 16 | 150533605489179940 |
| 17 | 1738920490541077131 |
| 18 | 20087504465180492695 |
| 19 | 232045017488460324836 |