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 | 5 |
| 3 | 29 |
| 4 | 186 |
| 5 | 1345 |
| 6 | 10544 |
| 7 | 86537 |
| 8 | 733409 |
| 9 | 6363181 |
| 10 | 56196113 |
| 11 | 503193256 |
| 12 | 4555800188 |
| 13 | 41621368073 |
| 14 | 383118399785 |
| 15 | 3549047966156 |
| 16 | 33056584174789 |
| 17 | 309353882390965 |
| 18 | 2907021742443974 |
| 19 | 27417323062119920 |
| 20 | 259423936749134301 |
| 21 | 2461813897281353729 |
| 22 | 23422580231698331834 |