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 | 10 |
| 2 | 73 |
| 3 | 478 |
| 4 | 2989 |
| 5 | 18298 |
| 6 | 110881 |
| 7 | 668566 |
| 8 | 4021237 |
| 9 | 24156946 |
| 10 | 145030249 |
| 11 | 870447214 |
| 12 | 5223480445 |
| 13 | 31343274154 |
| 14 | 188066819377 |
| 15 | 1128422439622 |
| 16 | 6770599207813 |
| 17 | 40623788957122 |
| 18 | 243743314873465 |