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 | 7 |
| 3 | 16 |
| 4 | 70 |
| 5 | 232 |
| 6 | 475 |
| 7 | 1933 |
| 8 | 1933 |
| 9 | 8494 |
| 10 | 28177 |
| 11 | 87226 |
| 12 | 87226 |
| 13 | 1150108 |
| 14 | 2744431 |
| 15 | 12310369 |
| 16 | 12310369 |
| 17 | 55357090 |
| 18 | 313637416 |
| 19 | 313637416 |
| 20 | 1475898883 |
| 21 | 1475898883 |
| 22 | 1475898883 |
| 23 | 32856958492 |
| 24 | 221143316146 |
| 25 | 221143316146 |
| 26 | 1915720535032 |
| 27 | 4457586363361 |
| 28 | 12083183848348 |
| 29 | 34959976303309 |