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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 10 |
| 6 | 31 |
| 7 | 257 |
| 8 | 16642 |
| 9 | 69247363 |
| 10 | 1198799355237125 |
| 11 | 359279973529237254190922184970 |
| 12 | 32270524844792355518177347536627638351478874995525184567711 |