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 | 4 |
| 2 | 40 |
| 3 | 524 |
| 4 | 976 |
| 5 | 20084 |
| 6 | 491192 |
| 7 | 13935164 |
| 8 | 450160544 |
| 9 | 93250876 |
| 10 | 1249813672 |
| 11 | 55206526972 |
| 12 | 2657681947952 |
| 13 | 46167204272716 |
| 14 | 235410309457592 |
| 15 | 14140794103168588 |
| 16 | 14376406243883968 |
| 17 | 978062783205294796 |