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 | 26 |
| 2 | 676 |
| 3 | 3910 |
| 4 | 23645 |
| 5 | 119965 |
| 6 | 491948 |
| 7 | 2090927 |
| 8 | 7990970 |
| 9 | 29983194 |
| 10 | 111123886 |
| 11 | 398530787 |
| 12 | 1431372629 |
| 13 | 5073097036 |
| 14 | 17882557521 |
| 15 | 62951565198 |
| 16 | 220461353120 |
| 17 | 771854520770 |
| 18 | 2697705853283 |
| 19 | 9418337941471 |
| 20 | 32876550226248 |
| 21 | 114672698592869 |