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 | 3 |
| 3 | 4 |
| 4 | 13 |
| 5 | 31 |
| 6 | 109 |
| 7 | 372 |
| 8 | 1446 |
| 9 | 5714 |
| 10 | 23791 |
| 11 | 100827 |
| 12 | 438019 |
| 13 | 1931818 |
| 14 | 8648820 |
| 15 | 39178079 |
| 16 | 179383748 |
| 17 | 828905252 |
| 18 | 3861958783 |
| 19 | 18125392905 |
| 20 | 85631735301 |
| 21 | 406977645228 |
| 22 | 1944737525915 |
| 23 | 9338989516911 |
| 24 | 45051405221284 |
| 25 | 218236995129380 |
| 26 | 1061256971559421 |