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 | 26 |
| 2 | 338 |
| 3 | 2938 |
| 4 | 19266 |
| 5 | 101946 |
| 6 | 454610 |
| 7 | 1761370 |
| 8 | 6065410 |
| 9 | 18892250 |
| 10 | 53972178 |
| 11 | 143027898 |
| 12 | 354870594 |
| 13 | 830764794 |
| 14 | 1847023698 |
| 15 | 3921503898 |
| 16 | 7988589570 |
| 17 | 15677993370 |
| 18 | 29746958930 |
| 19 | 54734043130 |
| 20 | 97926519106 |
| 21 | 170763634106 |
| 22 | 290835675858 |