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 | 1 |
| 2 | 585 |
| 3 | 20440 |
| 4 | 299593 |
| 5 | 1968876 |
| 6 | 11957400 |
| 7 | 40471600 |
| 8 | 153391689 |
| 9 | 402321277 |
| 10 | 1151792460 |
| 11 | 2359720584 |
| 12 | 6123680920 |
| 13 | 10609328380 |
| 14 | 23675886000 |
| 15 | 40243825440 |
| 16 | 78536544841 |
| 17 | 118612018980 |
| 18 | 235357947045 |
| 19 | 322734750520 |
| 20 | 589861467468 |
| 21 | 827239504000 |
| 22 | 1380436541640 |