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 | 4 |
| 4 | 19 |
| 5 | 60 |
| 6 | 237 |
| 7 | 850 |
| 8 | 3252 |
| 9 | 12168 |
| 10 | 46497 |
| 11 | 177052 |
| 12 | 679745 |
| 13 | 2612226 |
| 14 | 10079515 |
| 15 | 38961906 |
| 16 | 150982379 |
| 17 | 586067980 |
| 18 | 2278999145 |
| 19 | 8874984360 |
| 20 | 34609160383 |
| 21 | 135125659144 |
| 22 | 528166347564 |
| 23 | 2066529185116 |
| 24 | 8093134894351 |