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 | 8 |
| 3 | 50 |
| 4 | 351 |
| 5 | 2402 |
| 6 | 16864 |
| 7 | 117650 |
| 8 | 823894 |
| 9 | 5764851 |
| 10 | 40356016 |
| 11 | 282475250 |
| 12 | 1977343950 |
| 13 | 13841287202 |
| 14 | 96889128064 |
| 15 | 678223075300 |
| 16 | 4747562333837 |
| 17 | 33232930569602 |
| 18 | 232630519768872 |
| 19 | 1628413597910450 |
| 20 | 11398895225729502 |
| 21 | 79792266297729700 |
| 22 | 558545864365759264 |