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 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 3 |
| 4 | 27 |
| 5 | 60 |
| 6 | 355 |
| 7 | 1128 |
| 8 | 5694 |
| 9 | 21610 |
| 10 | 102462 |
| 11 | 426465 |
| 12 | 1978547 |
| 13 | 8659386 |
| 14 | 40003167 |
| 15 | 180241995 |
| 16 | 834994605 |
| 17 | 3830870574 |
| 18 | 17841265598 |
| 19 | 82854767805 |
| 20 | 388124777739 |
| 21 | 1818343250570 |
| 22 | 8565240659274 |
| 23 | 40398758877564 |
| 24 | 191254160050512 |
| 25 | 906956708168838 |
| 26 | 4312790630717025 |