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 | 2 |
| 1 | 3 |
| 2 | 13 |
| 3 | 91 |
| 4 | 881 |
| 5 | 10901 |
| 6 | 164305 |
| 7 | 2920695 |
| 8 | 59823937 |
| 9 | 1387420489 |
| 10 | 35937424601 |
| 11 | 1028320041299 |
| 12 | 32214185570737 |
| 13 | 1096589879846397 |
| 14 | 40304932850948641 |
| 15 | 1590815394987706351 |
| 16 | 67107935949376420097 |
| 17 | 3013151821625033296145 |
| 18 | 143473758373207779108265 |