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 | 6 |
| 2 | 48 |
| 3 | 476 |
| 4 | 5608 |
| 5 | 76372 |
| 6 | 1179016 |
| 7 | 20332580 |
| 8 | 387225120 |
| 9 | 8068825988 |
| 10 | 182564048824 |
| 11 | 4456476380644 |
| 12 | 116724944900272 |
| 13 | 3264981100202564 |
| 14 | 97130013288324552 |
| 15 | 3062011655207131748 |
| 16 | 101963095705628194624 |
| 17 | 3576126056313566090500 |
| 18 | 131762871920106615643480 |