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 | 20 |
| 2 | 190 |
| 3 | 1160 |
| 4 | 5225 |
| 5 | 18924 |
| 6 | 58350 |
| 7 | 158840 |
| 8 | 391020 |
| 9 | 886540 |
| 10 | 1877676 |
| 11 | 3753640 |
| 12 | 7140485 |
| 13 | 13014240 |
| 14 | 22846170 |
| 15 | 38794448 |
| 16 | 63969485 |
| 17 | 102744780 |
| 18 | 161143180 |
| 19 | 247386480 |
| 20 | 372472353 |
| 21 | 550858280 |
| 22 | 801535160 |
| 23 | 1148976360 |
| 24 | 1624208445 |
| 25 | 2266848372 |
| 26 | 3126467670 |
| 27 | 4264095520 |