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 | 34 |
| 4 | 203 |
| 5 | 1188 |
| 6 | 6929 |
| 7 | 40390 |
| 8 | 235415 |
| 9 | 1372104 |
| 10 | 7997213 |
| 11 | 46611178 |
| 12 | 271669859 |
| 13 | 1583407980 |
| 14 | 9228778025 |
| 15 | 53789260174 |
| 16 | 313506783023 |
| 17 | 1827251437968 |
| 18 | 10650001844789 |
| 19 | 62072759630770 |
| 20 | 361786555939835 |
| 21 | 2108646576008244 |
| 22 | 12290092900109633 |
| 23 | 71631910824649558 |