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 | 10 |
| 2 | 65 |
| 3 | 350 |
| 4 | 1630 |
| 5 | 6852 |
| 6 | 26635 |
| 7 | 97030 |
| 8 | 334990 |
| 9 | 1104730 |
| 10 | 3500740 |
| 11 | 10710950 |
| 12 | 31763985 |
| 13 | 91589730 |
| 14 | 257459110 |
| 15 | 707115814 |
| 16 | 1901162925 |
| 17 | 5011993330 |
| 18 | 12974420315 |
| 19 | 33021646490 |
| 20 | 82723179433 |
| 21 | 204175881220 |
| 22 | 496953703885 |
| 23 | 1193736868990 |
| 24 | 2832017802500 |
| 25 | 6639914803684 |