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 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 20 |
| 6 | 49 |
| 7 | 117 |
| 8 | 280 |
| 9 | 665 |
| 10 | 1583 |
| 11 | 3742 |
| 12 | 8876 |
| 13 | 20933 |
| 14 | 49521 |
| 15 | 116578 |
| 16 | 275204 |
| 17 | 646908 |
| 18 | 1524457 |
| 19 | 3579100 |
| 20 | 8421786 |
| 21 | 19752217 |
| 22 | 46419251 |
| 23 | 108774693 |
| 24 | 255351249 |
| 25 | 597911623 |
| 26 | 1402287934 |
| 27 | 3281303692 |
| 28 | 7689321700 |
| 29 | 17982126657 |
| 30 | 42108189097 |
| 31 | 98421806690 |
| 32 | 230322480772 |