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) |
|---|---|
| 1 | 1 |
| 2 | 41 |
| 3 | 1041 |
| 4 | 22193 |
| 5 | 433809 |
| 6 | 8057905 |
| 7 | 144769425 |
| 8 | 2541013617 |
| 9 | 43843180113 |
| 10 | 746691527217 |
| 11 | 12588144461329 |
| 12 | 210502738714097 |
| 13 | 3497001564166609 |
| 14 | 57781030561348017 |
| 15 | 950437243856526737 |
| 16 | 15574913193760097649 |
| 17 | 254416775893204873553 |
| 18 | 4144677558181255455025 |