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 | 66 |
| 2 | 1001 |
| 3 | 8008 |
| 4 | 43758 |
| 5 | 184756 |
| 6 | 646646 |
| 7 | 1961256 |
| 8 | 5311735 |
| 9 | 13123110 |
| 10 | 30045015 |
| 11 | 64512240 |
| 12 | 131128140 |
| 13 | 254186856 |
| 14 | 472733756 |
| 15 | 847660528 |
| 16 | 1471442973 |
| 17 | 2481256778 |
| 18 | 4076350421 |
| 19 | 6540715896 |
| 20 | 10272278170 |
| 21 | 15820024220 |
| 22 | 23930713170 |
| 23 | 35607051480 |
| 24 | 52179482355 |
| 25 | 75394027566 |