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 | 3 |
| 1 | 14 |
| 2 | 70 |
| 3 | 368 |
| 4 | 2002 |
| 5 | 11144 |
| 6 | 63010 |
| 7 | 360248 |
| 8 | 2076802 |
| 9 | 12050504 |
| 10 | 70290850 |
| 11 | 411802328 |
| 12 | 2421454402 |
| 13 | 14282991464 |
| 14 | 84472462690 |
| 15 | 500716911608 |
| 16 | 2973740844802 |
| 17 | 17689728038024 |
| 18 | 105375041354530 |
| 19 | 628434388600088 |