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 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 253 |
| 5 | 20754 |
| 6 | 5064301 |
| 7 | 3696964686 |
| 8 | 8088964208893 |
| 9 | 53079786931826952 |
| 10 | 1044822534120774924517 |
| 11 | 61696770693051062357722413 |
| 12 | 10929459535778338593167921597497 |
| 13 | 5808373834674826377471903826388912406 |
| 14 | 9260429805605038398327449254849233420999649 |