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 | 162 |
| 3 | 1079 |
| 4 | 941 |
| 5 | 4491 |
| 6 | 20842 |
| 7 | 89121 |
| 8 | 286746 |
| 9 | 1022779 |
| 10 | 4520360 |
| 11 | 18491493 |
| 12 | 67714259 |
| 13 | 259145846 |
| 14 | 1045498404 |
| 15 | 4177884352 |
| 16 | 16077695845 |
| 17 | 62395241080 |
| 18 | 246809269806 |
| 19 | 974367008077 |
| 20 | 3802389262429 |
| 21 | 14855944546521 |
| 22 | 58398777429077 |