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) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 65 |
| 4 | 279 |
| 5 | 894 |
| 6 | 2345 |
| 7 | 6174 |
| 8 | 66354 |
| 9 | 1005399 |
| 10 | 9737884 |
| 11 | 66699415 |
| 12 | 356586629 |
| 13 | 1585685916 |
| 14 | 6342292785 |
| 15 | 30560724590 |
| 16 | 264486626166 |
| 17 | 2926013859615 |
| 18 | 28611339267816 |
| 19 | 232062904906327 |
| 20 | 1588966488941437 |
| 21 | 9421788721876388 |
| 22 | 49444241961339027 |
| 23 | 233673191793220620 |