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 | 12 |
| 3 | 72 |
| 4 | 1012 |
| 5 | 9552 |
| 6 | 148764 |
| 7 | 1609496 |
| 8 | 26398020 |
| 9 | 305821344 |
| 10 | 5174354988 |
| 11 | 62479377384 |
| 12 | 1079265357204 |
| 13 | 13399747245040 |
| 14 | 234917433809724 |
| 15 | 2975608178304696 |
| 16 | 52748683164797668 |
| 17 | 678307369324850496 |