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 | 28 |
| 3 | 89 |
| 4 | 281 |
| 5 | 900 |
| 6 | 2935 |
| 7 | 9681 |
| 8 | 32020 |
| 9 | 105937 |
| 10 | 350311 |
| 11 | 1157860 |
| 12 | 3826287 |
| 13 | 12643725 |
| 14 | 41780500 |
| 15 | 138063433 |
| 16 | 456233915 |
| 17 | 1507641652 |
| 18 | 4982061047 |
| 19 | 16463412165 |
| 20 | 54403960596 |
| 21 | 179779885769 |
| 22 | 594089193379 |
| 23 | 1963189403076 |
| 24 | 6487431018743 |