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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 22 |
| 8 | 57 |
| 9 | 128 |
| 10 | 389 |
| 11 | 1904 |
| 12 | 9329 |
| 13 | 38040 |
| 14 | 132147 |
| 15 | 542648 |
| 16 | 3283633 |
| 17 | 20997824 |
| 18 | 114657097 |
| 19 | 536178880 |
| 20 | 2784500161 |
| 21 | 19876061312 |
| 22 | 153326461311 |
| 23 | 1034551839872 |
| 24 | 6051063485481 |
| 25 | 38079448046208 |
| 26 | 312420426154893 |
| 27 | 2785055242928768 |
| 28 | 22141255520251313 |