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 | 1 |
| 8 | 8 |
| 9 | 43 |
| 10 | 213 |
| 11 | 1060 |
| 12 | 5468 |
| 13 | 29765 |
| 14 | 173035 |
| 15 | 1074526 |
| 16 | 7059804 |
| 17 | 48235007 |
| 18 | 336048291 |
| 19 | 2345912476 |
| 20 | 16193974418 |
| 21 | 109563962854 |
| 22 | 722594600193 |
| 23 | 4631590699334 |
| 24 | 28811338570224 |
| 25 | 173868030213652 |