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 | 5 |
| 2 | 41 |
| 3 | 429 |
| 4 | 5329 |
| 5 | 75989 |
| 6 | 1215481 |
| 7 | 21453693 |
| 8 | 412820385 |
| 9 | 8579772325 |
| 10 | 191166679497 |
| 11 | 4538638641997 |
| 12 | 114238219541617 |
| 13 | 3035305413035125 |
| 14 | 84819458105387417 |
| 15 | 2484842038066995485 |
| 16 | 76101249873390595905 |
| 17 | 2430497813260105226053 |
| 18 | 80769536433102942870377 |
| 19 | 2787318255464814752951533 |