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 | 255 |
| 2 | 6305 |
| 3 | 58975 |
| 4 | 325089 |
| 5 | 1288991 |
| 6 | 4085185 |
| 7 | 11012415 |
| 8 | 26269505 |
| 9 | 56953279 |
| 10 | 114358881 |
| 11 | 215622815 |
| 12 | 385749025 |
| 13 | 660058335 |
| 14 | 1087101569 |
| 15 | 1732076671 |
| 16 | 2680790145 |
| 17 | 4044203135 |
| 18 | 5963602465 |
| 19 | 8616436959 |
| 20 | 12222859361 |
| 21 | 17053014175 |
| 22 | 23435111745 |
| 23 | 31764328895 |
| 24 | 42512576449 |