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 | 7 |
| 4 | 7 |
| 5 | 31 |
| 6 | 49 |
| 7 | 145 |
| 8 | 289 |
| 9 | 727 |
| 10 | 1591 |
| 11 | 3775 |
| 12 | 8545 |
| 13 | 19873 |
| 14 | 45505 |
| 15 | 105127 |
| 16 | 241639 |
| 17 | 557023 |
| 18 | 1281937 |
| 19 | 2953009 |
| 20 | 6798817 |
| 21 | 15657847 |
| 22 | 36054295 |
| 23 | 83027839 |
| 24 | 191190721 |
| 25 | 440274241 |
| 26 | 1013846401 |
| 27 | 2334669127 |
| 28 | 5376208327 |
| 29 | 12380215711 |
| 30 | 28508840689 |