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 | 0 |
| 2 | 23 |
| 3 | 620 |
| 4 | 723 |
| 5 | 840 |
| 6 | 4223 |
| 7 | 4820 |
| 8 | 5499 |
| 9 | 25200 |
| 10 | 28679 |
| 11 | 32636 |
| 12 | 147459 |
| 13 | 167736 |
| 14 | 190799 |
| 15 | 860036 |
| 16 | 978219 |
| 17 | 1112640 |
| 18 | 5013239 |
| 19 | 5702060 |
| 20 | 6485523 |
| 21 | 29219880 |
| 22 | 33234623 |
| 23 | 37800980 |
| 24 | 170306523 |
| 25 | 193706160 |
| 26 | 220320839 |
| 27 | 992619740 |
| 28 | 1129002819 |
| 29 | 1284124536 |
| 30 | 5785412399 |
| 31 | 6580311236 |