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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | 13 |
| 7 | 31 |
| 8 | 63 |
| 9 | 141 |
| 10 | 293 |
| 11 | 665 |
| 12 | 1553 |
| 13 | 3795 |
| 14 | 9225 |
| 15 | 22257 |
| 16 | 53623 |
| 17 | 132277 |
| 18 | 321651 |
| 19 | 786553 |
| 20 | 1928565 |
| 21 | 4806503 |
| 22 | 11885969 |
| 23 | 29498995 |
| 24 | 73362933 |
| 25 | 184210629 |
| 26 | 460165983 |
| 27 | 1151961103 |