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 | 10 |
| 2 | 100 |
| 3 | 390 |
| 4 | 1485 |
| 5 | 6398 |
| 6 | 23856 |
| 7 | 82739 |
| 8 | 291364 |
| 9 | 997288 |
| 10 | 3297100 |
| 11 | 10818024 |
| 12 | 35133264 |
| 13 | 112323561 |
| 14 | 356011440 |
| 15 | 1121062052 |
| 16 | 3501522000 |
| 17 | 10866865736 |
| 18 | 33562033288 |
| 19 | 103140966600 |
| 20 | 315558380637 |
| 21 | 961941393008 |
| 22 | 2922406648218 |