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 | 0 |
| 1 | 3 |
| 2 | 19 |
| 3 | 54 |
| 4 | 199 |
| 5 | 408 |
| 6 | 1612 |
| 7 | 3090 |
| 8 | 11023 |
| 9 | 26487 |
| 10 | 80994 |
| 11 | 199686 |
| 12 | 676540 |
| 13 | 1700832 |
| 14 | 5285096 |
| 15 | 15197274 |
| 16 | 45739039 |
| 17 | 131368404 |
| 18 | 401655943 |
| 19 | 1172222958 |
| 20 | 3549402474 |
| 21 | 10533769146 |
| 22 | 31617172980 |
| 23 | 94336116834 |
| 24 | 283990486780 |
| 25 | 848323147233 |
| 26 | 2546924693306 |
| 27 | 7631598676410 |
| 28 | 22903854049016 |
| 29 | 68645946621360 |
| 30 | 206035134959112 |
| 31 | 617739968277066 |
| 32 | 1853594327953471 |