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 | 10 |
| 2 | 50 |
| 3 | 216 |
| 4 | 867 |
| 5 | 3318 |
| 6 | 12314 |
| 7 | 44858 |
| 8 | 161257 |
| 9 | 574237 |
| 10 | 2029778 |
| 11 | 7132780 |
| 12 | 24943546 |
| 13 | 86875164 |
| 14 | 301535122 |
| 15 | 1043529630 |
| 16 | 3602228998 |
| 17 | 12407419230 |
| 18 | 42653320657 |
| 19 | 146380696477 |
| 20 | 501599529832 |
| 21 | 1716499421419 |
| 22 | 5866845453921 |
| 23 | 20030578702565 |