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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 79 |
| 5 | 1987 |
| 6 | 16834 |
| 7 | 85275 |
| 8 | 317471 |
| 9 | 962089 |
| 10 | 2515262 |
| 11 | 5882109 |
| 12 | 12605095 |
| 13 | 25175191 |
| 14 | 47443474 |
| 15 | 85152487 |
| 16 | 146608359 |
| 17 | 243516365 |
| 18 | 392004286 |
| 19 | 613859609 |
| 20 | 938008287 |
| 21 | 1402264459 |
| 22 | 2055382210 |
| 23 | 2959442131 |
| 24 | 4192607119 |