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 | 1 |
| 2 | 7 |
| 3 | 86 |
| 4 | 1473 |
| 5 | 32344 |
| 6 | 866695 |
| 7 | 27422352 |
| 8 | 1000578817 |
| 9 | 41361536384 |
| 10 | 1910451937671 |
| 11 | 97512721964800 |
| 12 | 5450486787062977 |
| 13 | 331112639931669504 |
| 14 | 21722219855305516807 |
| 15 | 1530517712811373819904 |
| 16 | 115269154497700063898625 |
| 17 | 9241045907270523509112832 |
| 18 | 785719407951447904088069383 |