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 | 8 |
| 3 | 60 |
| 4 | 368 |
| 5 | 2100 |
| 6 | 11528 |
| 7 | 61740 |
| 8 | 325088 |
| 9 | 1690980 |
| 10 | 8717048 |
| 11 | 44633820 |
| 12 | 227363408 |
| 13 | 1153594260 |
| 14 | 5835080168 |
| 15 | 29443836300 |
| 16 | 148292923328 |
| 17 | 745759583940 |
| 18 | 3745977788888 |
| 19 | 18798608421180 |
| 20 | 94267920012848 |
| 21 | 472439111692020 |
| 22 | 2366593604971208 |