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) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 104 |
| 3 | 663 |
| 4 | 3614 |
| 5 | 17576 |
| 6 | 78299 |
| 7 | 324766 |
| 8 | 1269242 |
| 9 | 4715204 |
| 10 | 16762551 |
| 11 | 57327556 |
| 12 | 189418658 |
| 13 | 606787572 |
| 14 | 1890046210 |
| 15 | 5738539729 |
| 16 | 17019191579 |
| 17 | 49394158541 |
| 18 | 140507716414 |
| 19 | 392299039821 |
| 20 | 1076369417474 |
| 21 | 2905414115877 |
| 22 | 7722941644821 |
| 23 | 20233362612424 |
| 24 | 52288914446548 |
| 25 | 133389316899462 |