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 | 1 |
| 2 | 12 |
| 3 | 87 |
| 4 | 416 |
| 5 | 1475 |
| 6 | 4236 |
| 7 | 10437 |
| 8 | 22912 |
| 9 | 45981 |
| 10 | 85900 |
| 11 | 151371 |
| 12 | 254112 |
| 13 | 409487 |
| 14 | 637196 |
| 15 | 962025 |
| 16 | 1414656 |
| 17 | 2032537 |
| 18 | 2860812 |
| 19 | 3953311 |
| 20 | 5373600 |
| 21 | 7196091 |
| 22 | 9507212 |
| 23 | 12406637 |
| 24 | 16008576 |
| 25 | 20443125 |
| 26 | 25857676 |
| 27 | 32418387 |
| 28 | 40311712 |