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 | 9 |
| 3 | 179 |
| 4 | 6655 |
| 5 | 400581 |
| 6 | 35530421 |
| 7 | 4357960999 |
| 8 | 706230728379 |
| 9 | 146116931998025 |
| 10 | 37577989723572001 |
| 11 | 11758017370126904091 |
| 12 | 4398121660346674034039 |
| 13 | 1938019214715102033590029 |
| 14 | 993580299268226843514372045 |
| 15 | 586357970017371399763899232271 |