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 | 6 |
| 3 | 25 |
| 4 | 56 |
| 5 | 17105 |
| 6 | 17161 |
| 7 | 154393 |
| 8 | 325947 |
| 9 | 480340 |
| 10 | 2247307 |
| 11 | 13964182 |
| 12 | 197745855 |
| 13 | 607201747 |
| 14 | 804947602 |
| 15 | 11071520573 |
| 16 | 56162550467 |
| 17 | 67234071040 |
| 18 | 526801047747 |
| 19 | 12183658169221 |
| 20 | 12710459216968 |
| 21 | 215551005640709 |