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 | 0 |
| 2 | 2 |
| 3 | 1025 |
| 4 | 61098 |
| 5 | 1108650 |
| 6 | 10933324 |
| 7 | 71340451 |
| 8 | 354864276 |
| 9 | 1427557524 |
| 10 | 4924107550 |
| 11 | 14914341925 |
| 12 | 40912232702 |
| 13 | 102769130750 |
| 14 | 240910097848 |
| 15 | 529882277575 |
| 16 | 1107606410024 |
| 17 | 2206044295976 |
| 18 | 4225524980826 |
| 19 | 7792505423049 |
| 20 | 13933571680850 |
| 21 | 24163571680850 |
| 22 | 40869390083652 |