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 | 8 |
| 2 | 38 |
| 3 | 140 |
| 4 | 443 |
| 5 | 1268 |
| 6 | 3384 |
| 7 | 8584 |
| 8 | 20965 |
| 9 | 49744 |
| 10 | 115402 |
| 11 | 262996 |
| 12 | 590831 |
| 13 | 1311900 |
| 14 | 2884956 |
| 15 | 6293040 |
| 16 | 13633305 |
| 17 | 29362200 |
| 18 | 62916910 |
| 19 | 134220380 |
| 20 | 285215651 |
| 21 | 603983108 |
| 22 | 1275072128 |
| 23 | 2684358680 |
| 24 | 5637149133 |
| 25 | 11811165088 |