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 | 4 |
| 2 | 193 |
| 3 | 776 |
| 4 | 37441 |
| 5 | 150540 |
| 6 | 7263361 |
| 7 | 29203984 |
| 8 | 1409054593 |
| 9 | 5665422356 |
| 10 | 273349327681 |
| 11 | 1099062733080 |
| 12 | 53028360515521 |
| 13 | 213212504795164 |
| 14 | 10287228590683393 |
| 15 | 41362126867528736 |
| 16 | 1995669318232062721 |
| 17 | 8024039399795779620 |
| 18 | 387149560508429484481 |