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 | 12 |
| 3 | 119 |
| 4 | 1290 |
| 5 | 16957 |
| 6 | 285264 |
| 7 | 6343523 |
| 8 | 190424310 |
| 9 | 7826128009 |
| 10 | 444658035228 |
| 11 | 35162773747631 |
| 12 | 3888419271339330 |
| 13 | 603295404971492053 |
| 14 | 131635270366023841896 |
| 15 | 40458451431717420232187 |
| 16 | 17536781855825299937977230 |
| 17 | 10728658644626168469625854241 |