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 | 8 |
| 4 | 28 |
| 5 | 111 |
| 6 | 436 |
| 7 | 1763 |
| 8 | 7176 |
| 9 | 29521 |
| 10 | 122182 |
| 11 | 508595 |
| 12 | 2126312 |
| 13 | 8923136 |
| 14 | 37563930 |
| 15 | 158563368 |
| 16 | 670893296 |
| 17 | 2844444761 |
| 18 | 12081753410 |
| 19 | 51400091942 |
| 20 | 218990735668 |
| 21 | 934228356445 |
| 22 | 3990177231742 |
| 23 | 17060699906541 |
| 24 | 73017457810032 |
| 25 | 312785412844736 |
| 26 | 1340988707637776 |
| 27 | 5753539499846507 |