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 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 98 |
| 5 | 400 |
| 6 | 1785 |
| 7 | 7980 |
| 8 | 37674 |
| 9 | 178164 |
| 10 | 874146 |
| 11 | 4294752 |
| 12 | 21667932 |
| 13 | 109436184 |
| 14 | 563910633 |
| 15 | 2908233900 |
| 16 | 15235550330 |
| 17 | 79870553620 |
| 18 | 424021948350 |
| 19 | 2252356700880 |
| 20 | 12088746573540 |
| 21 | 64913104882080 |
| 22 | 351594254659830 |
| 23 | 1905139854213960 |
| 24 | 10399223643879420 |
| 25 | 56783986550235000 |