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 | 14 |
| 2 | 154 |
| 3 | 1526 |
| 4 | 14266 |
| 5 | 128534 |
| 6 | 1129114 |
| 7 | 9738806 |
| 8 | 82851706 |
| 9 | 697402454 |
| 10 | 5821341274 |
| 11 | 48265581686 |
| 12 | 397988613946 |
| 13 | 3266956634774 |
| 14 | 26716987140634 |
| 15 | 217805235562166 |
| 16 | 1770927253556986 |
| 17 | 14366815611873494 |
| 18 | 116330307978911194 |
| 19 | 940412945418752246 |
| 20 | 7591696934462256826 |