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 | 3 |
| 5 | 6 |
| 6 | 15 |
| 7 | 35 |
| 8 | 89 |
| 9 | 218 |
| 10 | 571 |
| 11 | 1446 |
| 12 | 3834 |
| 13 | 10003 |
| 14 | 26864 |
| 15 | 71120 |
| 16 | 193602 |
| 17 | 519409 |
| 18 | 1423539 |
| 19 | 3865590 |
| 20 | 10666555 |
| 21 | 29185905 |
| 22 | 81078369 |
| 23 | 223367624 |
| 24 | 623192655 |
| 25 | 1727907182 |
| 26 | 4840616872 |
| 27 | 13482957335 |
| 28 | 37923616139 |
| 29 | 106070402639 |
| 30 | 299214369115 |
| 31 | 840217034149 |