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 | 30 |
| 2 | 465 |
| 3 | 4990 |
| 4 | 41820 |
| 5 | 292236 |
| 6 | 1773325 |
| 7 | 9603210 |
| 8 | 47322525 |
| 9 | 215286380 |
| 10 | 914269641 |
| 11 | 3656192760 |
| 12 | 13865226845 |
| 13 | 50148901590 |
| 14 | 173821904265 |
| 15 | 579696375972 |
| 16 | 1866529110420 |
| 17 | 5819476726230 |
| 18 | 17613901516660 |
| 19 | 51870170192610 |
| 20 | 148909462006422 |
| 21 | 417468856858550 |
| 22 | 1144709400114480 |