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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 5 |
| 7 | 20 |
| 8 | 28 |
| 9 | 110 |
| 10 | 169 |
| 11 | 663 |
| 12 | 1078 |
| 13 | 4217 |
| 14 | 7169 |
| 15 | 27979 |
| 16 | 49191 |
| 17 | 191440 |
| 18 | 345771 |
| 19 | 1341974 |
| 20 | 2477719 |
| 21 | 9589567 |
| 22 | 18034670 |
| 23 | 69612556 |
| 24 | 132984290 |
| 25 | 511987473 |
| 26 | 991391707 |
| 27 | 3807503552 |
| 28 | 7460270591 |
| 29 | 28585315026 |
| 30 | 56595367747 |
| 31 | 216381073935 |
| 32 | 432396092153 |