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 | 100 |
| 3 | 292 |
| 4 | 870 |
| 5 | 2774 |
| 6 | 9060 |
| 7 | 30440 |
| 8 | 103838 |
| 9 | 359206 |
| 10 | 1254128 |
| 11 | 4412792 |
| 12 | 15616086 |
| 13 | 55522546 |
| 14 | 198135096 |
| 15 | 709186104 |
| 16 | 2544574170 |
| 17 | 9148317066 |
| 18 | 32944585328 |
| 19 | 118801548180 |
| 20 | 428898598218 |
| 21 | 1549885877794 |
| 22 | 5605176866756 |
| 23 | 20284633906700 |