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 | 13 |
| 2 | 64 |
| 3 | 307 |
| 4 | 1471 |
| 5 | 7048 |
| 6 | 33769 |
| 7 | 161797 |
| 8 | 775216 |
| 9 | 3714283 |
| 10 | 17796199 |
| 11 | 85266712 |
| 12 | 408537361 |
| 13 | 1957420093 |
| 14 | 9378563104 |
| 15 | 44935395427 |
| 16 | 215298414031 |
| 17 | 1031556674728 |
| 18 | 4942484959609 |
| 19 | 23680868123317 |
| 20 | 113461855656976 |
| 21 | 543628410161563 |
| 22 | 2604680195150839 |
| 23 | 12479772565592632 |