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 | 50 |
| 3 | 615 |
| 4 | 10192 |
| 5 | 214571 |
| 6 | 5544394 |
| 7 | 171367020 |
| 8 | 6208928376 |
| 9 | 259542887975 |
| 10 | 12356823485580 |
| 11 | 662921411131909 |
| 12 | 39714830070598204 |
| 13 | 2636484537372437498 |
| 14 | 192653800829700013970 |
| 15 | 15405383160836582657251 |