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 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 53 |
| 4 | 336 |
| 5 | 2105 |
| 6 | 13144 |
| 7 | 81997 |
| 8 | 511392 |
| 9 | 3189169 |
| 10 | 19888040 |
| 11 | 124023461 |
| 12 | 773419248 |
| 13 | 4823095913 |
| 14 | 30077155576 |
| 15 | 187563189565 |
| 16 | 1169656805184 |
| 17 | 7294059356257 |
| 18 | 45486249993032 |
| 19 | 283655347025429 |
| 20 | 1768894026280080 |