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 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 376 |
| 4 | 20241 |
| 5 | 1427156 |
| 6 | 121639250 |
| 7 | 12007003824 |
| 8 | 1337583507153 |
| 9 | 165328009728652 |
| 10 | 22404009743110566 |
| 11 | 3299256277254713760 |
| 12 | 524366465815117346250 |
| 13 | 89448728780073829991976 |
| 14 | 16301356287284530869810308 |
| 15 | 3161258841758986060906197536 |
| 16 | 650090787950164885954804021185 |