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 | 58 |
| 3 | 286 |
| 4 | 1618 |
| 5 | 9330 |
| 6 | 54994 |
| 7 | 328058 |
| 8 | 1973026 |
| 9 | 11928418 |
| 10 | 72360138 |
| 11 | 439900746 |
| 12 | 2677993234 |
| 13 | 16317209282 |
| 14 | 99477496666 |
| 15 | 606677367546 |
| 16 | 3700738695234 |
| 17 | 22577766952946 |
| 18 | 137756725752298 |
| 19 | 840561549454570 |