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 | 1 |
| 3 | 4 |
| 4 | 5 |
| 5 | 16 |
| 6 | 82 |
| 7 | 169 |
| 8 | 541 |
| 9 | 2272 |
| 10 | 17966 |
| 11 | 44419 |
| 12 | 201830 |
| 13 | 802751 |
| 14 | 4897453 |
| 15 | 52275409 |
| 16 | 166257661 |
| 17 | 840363296 |
| 18 | 4321172134 |
| 19 | 24358246735 |
| 20 | 183351656650 |
| 21 | 2762567051857 |
| 22 | 10112898715063 |
| 23 | 62269802986835 |
| 24 | 343651382271526 |
| 25 | 2352104168848091 |
| 26 | 15649414071734847 |