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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 43 |
| 8 | 102 |
| 9 | 250 |
| 10 | 623 |
| 11 | 1579 |
| 12 | 4042 |
| 13 | 10473 |
| 14 | 27356 |
| 15 | 72049 |
| 16 | 190991 |
| 17 | 509384 |
| 18 | 1365586 |
| 19 | 3678369 |
| 20 | 9949452 |
| 21 | 27014550 |
| 22 | 73600711 |
| 23 | 201153143 |
| 24 | 551329088 |
| 25 | 1515078957 |
| 26 | 4173575232 |
| 27 | 11522620375 |
| 28 | 31878127954 |
| 29 | 88362886345 |
| 30 | 245372235144 |
| 31 | 682508792835 |