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 | 330 |
| 4 | 1430 |
| 5 | 5510 |
| 6 | 19395 |
| 7 | 63440 |
| 8 | 195250 |
| 9 | 570570 |
| 10 | 1594315 |
| 11 | 4283270 |
| 12 | 11113440 |
| 13 | 27949580 |
| 14 | 68340360 |
| 15 | 162880080 |
| 16 | 379227010 |
| 17 | 864153940 |
| 18 | 1930443705 |
| 19 | 4233724000 |
| 20 | 9127235430 |
| 21 | 19364099520 |
| 22 | 40470110005 |
| 23 | 83395632580 |
| 24 | 169581447000 |
| 25 | 340533848010 |