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 | 2 |
| 3 | 7 |
| 4 | 22 |
| 5 | 69 |
| 6 | 208 |
| 7 | 634 |
| 8 | 1903 |
| 9 | 5734 |
| 10 | 17210 |
| 11 | 51702 |
| 12 | 155107 |
| 13 | 465561 |
| 14 | 1396684 |
| 15 | 4190689 |
| 16 | 12572144 |
| 17 | 37718360 |
| 18 | 113155081 |
| 19 | 339471195 |
| 20 | 1018413586 |
| 21 | 3055258062 |
| 22 | 9165774828 |
| 23 | 27497376189 |
| 24 | 82492128568 |
| 25 | 247476542954 |
| 26 | 742429628932 |
| 27 | 2227289352360 |
| 28 | 6681868062822 |
| 29 | 20045605585809 |