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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 10 |
| 6 | 26 |
| 7 | 78 |
| 8 | 311 |
| 9 | 1200 |
| 10 | 4626 |
| 11 | 20831 |
| 12 | 98953 |
| 13 | 468700 |
| 14 | 2399950 |
| 15 | 13084381 |
| 16 | 72319603 |
| 17 | 418017254 |
| 18 | 2545312690 |
| 19 | 15862538760 |
| 20 | 102062357538 |
| 21 | 684056780835 |
| 22 | 4705498914532 |
| 23 | 33243430090585 |
| 24 | 242674907474251 |
| 25 | 1817152315653253 |
| 26 | 13936783521933730 |
| 27 | 109852260904263059 |
| 28 | 886654177280345126 |
| 29 | 7315920883507888061 |
| 30 | 61812165690051526144 |