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 | 10 |
| 2 | 58 |
| 3 | 256 |
| 4 | 955 |
| 5 | 3178 |
| 6 | 9740 |
| 7 | 28064 |
| 8 | 77093 |
| 9 | 203930 |
| 10 | 523262 |
| 11 | 1309520 |
| 12 | 3209871 |
| 13 | 7731642 |
| 14 | 18348240 |
| 15 | 42989520 |
| 16 | 99612345 |
| 17 | 228586890 |
| 18 | 520090690 |
| 19 | 1174401760 |
| 20 | 2634019171 |
| 21 | 5872021450 |
| 22 | 13019115028 |
| 23 | 28722588736 |
| 24 | 63082326605 |