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 | 5 |
| 2 | 25 |
| 3 | 122 |
| 4 | 581 |
| 5 | 2724 |
| 6 | 12734 |
| 7 | 59406 |
| 8 | 276816 |
| 9 | 1289208 |
| 10 | 6002949 |
| 11 | 27948445 |
| 12 | 130114896 |
| 13 | 605739129 |
| 14 | 2819935996 |
| 15 | 13127753699 |
| 16 | 61113960653 |
| 17 | 284504996836 |
| 18 | 1324460800690 |
| 19 | 6165782447251 |
| 20 | 28703656674418 |
| 21 | 133624541803551 |
| 22 | 622064214270768 |