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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 8 |
| 5 | 36 |
| 6 | 176 |
| 7 | 918 |
| 8 | 4936 |
| 9 | 26958 |
| 10 | 150026 |
| 11 | 846177 |
| 12 | 4829398 |
| 13 | 27836499 |
| 14 | 161828375 |
| 15 | 947782262 |
| 16 | 5587055678 |
| 17 | 33124063134 |
| 18 | 197385032889 |
| 19 | 1181572853600 |
| 20 | 7102047195736 |
| 21 | 42846230488269 |
| 22 | 259358408077863 |
| 23 | 1574775193889333 |
| 24 | 9588601977357132 |
| 25 | 58534511044031645 |