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) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 230 |
| 4 | 1020 |
| 5 | 4120 |
| 6 | 16109 |
| 7 | 61003 |
| 8 | 227197 |
| 9 | 834806 |
| 10 | 3041436 |
| 11 | 11009856 |
| 12 | 39680145 |
| 13 | 142545383 |
| 14 | 510891025 |
| 15 | 1827957230 |
| 16 | 6532356532 |
| 17 | 23322885552 |
| 18 | 83216416445 |
| 19 | 296774223739 |
| 20 | 1058010185133 |
| 21 | 3770863749966 |
| 22 | 13437211488900 |
| 23 | 47875876583016 |