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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 8 |
| 10 | 47 |
| 11 | 277 |
| 12 | 1775 |
| 13 | 12616 |
| 14 | 102445 |
| 15 | 957357 |
| 16 | 10174566 |
| 17 | 119235347 |
| 18 | 1482297912 |
| 19 | 18884450721 |
| 20 | 240477821389 |
| 21 | 3012879828566 |
| 22 | 36800049400028 |
| 23 | 436068618826236 |
| 24 | 5001537857507095 |
| 25 | 55482177298724426 |
| 26 | 595303034603214108 |
| 27 | 6181562837200509792 |
| 28 | 62170512250565592346 |