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 | 7 |
| 2 | 49 |
| 3 | 252 |
| 4 | 1036 |
| 5 | 3703 |
| 6 | 12453 |
| 7 | 42386 |
| 8 | 151882 |
| 9 | 567835 |
| 10 | 2147149 |
| 11 | 8034340 |
| 12 | 29610140 |
| 13 | 108114007 |
| 14 | 394245755 |
| 15 | 1442791435 |
| 16 | 5301606775 |
| 17 | 19520651849 |
| 18 | 71865418075 |
| 19 | 264265863322 |
| 20 | 970764224658 |
| 21 | 3564641145009 |
| 22 | 13091320557593 |
| 23 | 48095042423647 |