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 | 2 |
| 2 | 7 |
| 3 | 32 |
| 4 | 177 |
| 5 | 1122 |
| 6 | 7898 |
| 7 | 60398 |
| 8 | 494078 |
| 9 | 4274228 |
| 10 | 38763298 |
| 11 | 366039104 |
| 12 | 3579512809 |
| 13 | 36091415154 |
| 14 | 373853631974 |
| 15 | 3966563630394 |
| 16 | 42997859838010 |
| 17 | 475191259977060 |
| 18 | 5344193918791710 |
| 19 | 61066078557804360 |
| 20 | 707984385321707910 |
| 21 | 8318207051955884772 |
| 22 | 98936727936728464152 |