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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 9 |
| 6 | 30 |
| 7 | 69 |
| 8 | 203 |
| 9 | 519 |
| 10 | 1466 |
| 11 | 3933 |
| 12 | 11025 |
| 13 | 30345 |
| 14 | 85190 |
| 15 | 238063 |
| 16 | 671651 |
| 17 | 1895265 |
| 18 | 5376856 |
| 19 | 15279117 |
| 20 | 43568435 |
| 21 | 124478129 |
| 22 | 356537150 |
| 23 | 1023113061 |
| 24 | 2941713513 |
| 25 | 8472215013 |
| 26 | 24439992746 |
| 27 | 70604898953 |
| 28 | 204253079165 |
| 29 | 591631927785 |
| 30 | 1715743930880 |
| 31 | 4981202429973 |