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 | 2 |
| 2 | 8 |
| 3 | 39 |
| 4 | 199 |
| 5 | 1027 |
| 6 | 5316 |
| 7 | 27539 |
| 8 | 142694 |
| 9 | 739416 |
| 10 | 3831589 |
| 11 | 19855045 |
| 12 | 102887673 |
| 13 | 533158028 |
| 14 | 2762794601 |
| 15 | 14316644946 |
| 16 | 74188042696 |
| 17 | 384438233215 |
| 18 | 1992137140383 |
| 19 | 10323141778619 |
| 20 | 53493935746148 |
| 21 | 277202543857995 |
| 22 | 1436447874880342 |
| 23 | 7443591492820888 |