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 | 5 |
| 2 | 24 |
| 3 | 112 |
| 4 | 536 |
| 5 | 2576 |
| 6 | 12392 |
| 7 | 59610 |
| 8 | 286752 |
| 9 | 1379411 |
| 10 | 6635624 |
| 11 | 31920520 |
| 12 | 153552936 |
| 13 | 738662923 |
| 14 | 3553321281 |
| 15 | 17093171649 |
| 16 | 82226315586 |
| 17 | 395547831245 |
| 18 | 1902773895293 |
| 19 | 9153250784395 |
| 20 | 44031505860633 |
| 21 | 211812562992414 |
| 22 | 1018919543279305 |
| 23 | 4901489415968643 |
| 24 | 23578503968558227 |