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 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 33 |
| 4 | 544 |
| 5 | 1121 |
| 6 | 18480 |
| 7 | 38081 |
| 8 | 627776 |
| 9 | 1293633 |
| 10 | 21325904 |
| 11 | 43945441 |
| 12 | 724452960 |
| 13 | 1492851361 |
| 14 | 24610074736 |
| 15 | 50713000833 |
| 16 | 836018088064 |
| 17 | 1722749176961 |
| 18 | 28400004919440 |
| 19 | 58522759015841 |
| 20 | 964764149172896 |
| 21 | 1988051057361633 |
| 22 | 32773581066959024 |
| 23 | 67535213191279681 |