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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 24 |
| 7 | 51 |
| 8 | 122 |
| 9 | 291 |
| 10 | 756 |
| 11 | 1979 |
| 12 | 5526 |
| 13 | 15627 |
| 14 | 46496 |
| 15 | 140451 |
| 16 | 442194 |
| 17 | 1414931 |
| 18 | 4687212 |
| 19 | 15785451 |
| 20 | 54764846 |
| 21 | 193129659 |
| 22 | 698978136 |
| 23 | 2570480147 |
| 24 | 9672977706 |
| 25 | 36967490691 |
| 26 | 144232455524 |
| 27 | 571177352091 |
| 28 | 2304843053382 |
| 29 | 9434493132011 |
| 30 | 39289892366736 |