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 | 1 |
| 2 | 10 |
| 3 | 136 |
| 4 | 2290 |
| 5 | 42376 |
| 6 | 834472 |
| 7 | 17125354 |
| 8 | 362345362 |
| 9 | 7847250409 |
| 10 | 173103115760 |
| 11 | 3875837737520 |
| 12 | 87857163416200 |
| 13 | 2012268157890524 |
| 14 | 46497242510288804 |
| 15 | 1082614775186919136 |
| 16 | 25374686712458407442 |
| 17 | 598217593341171422090 |
| 18 | 14176230568954212214234 |