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 | 6 |
| 2 | 26 |
| 3 | 111 |
| 4 | 460 |
| 5 | 1905 |
| 6 | 7910 |
| 7 | 32880 |
| 8 | 136675 |
| 9 | 568050 |
| 10 | 2360825 |
| 11 | 9811650 |
| 12 | 40777750 |
| 13 | 169474875 |
| 14 | 704348000 |
| 15 | 2927312625 |
| 16 | 12166086250 |
| 17 | 50562982500 |
| 18 | 210142784375 |
| 19 | 873366003750 |
| 20 | 3629761440625 |
| 21 | 15085506018750 |
| 22 | 62696266831250 |
| 23 | 260569441284375 |
| 24 | 1082942209562500 |