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) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 7 |
| 6 | 176 |
| 7 | 1976 |
| 8 | 12565 |
| 9 | 57275 |
| 10 | 207018 |
| 11 | 634166 |
| 12 | 1711262 |
| 13 | 4181915 |
| 14 | 9428657 |
| 15 | 19892816 |
| 16 | 39684027 |
| 17 | 75473209 |
| 18 | 137721045 |
| 19 | 242391212 |
| 20 | 413215132 |
| 21 | 684733527 |
| 22 | 1106194950 |
| 23 | 1746637600 |
| 24 | 2701244609 |
| 25 | 4099429895 |
| 26 | 6114748948 |
| 27 | 8977257362 |
| 28 | 12988406970 |
| 29 | 18539308619 |
| 30 | 26132434991 |