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 | 4 |
| 3 | 7 |
| 4 | 16 |
| 5 | 21 |
| 6 | 52 |
| 7 | 71 |
| 8 | 160 |
| 9 | 277 |
| 10 | 564 |
| 11 | 1035 |
| 12 | 2176 |
| 13 | 4109 |
| 14 | 8348 |
| 15 | 16467 |
| 16 | 33088 |
| 17 | 65553 |
| 18 | 131740 |
| 19 | 262163 |
| 20 | 525456 |
| 21 | 1048817 |
| 22 | 2099244 |
| 23 | 4194327 |
| 24 | 8393344 |
| 25 | 16777321 |
| 26 | 33562676 |
| 27 | 67109695 |
| 28 | 134234480 |
| 29 | 268435485 |
| 30 | 536905572 |
| 31 | 1073741855 |
| 32 | 2147549824 |