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 | 6 |
| 4 | 22 |
| 5 | 88 |
| 6 | 367 |
| 7 | 1568 |
| 8 | 6810 |
| 9 | 29943 |
| 10 | 132958 |
| 11 | 595227 |
| 12 | 2683373 |
| 13 | 12170778 |
| 14 | 55499358 |
| 15 | 254297805 |
| 16 | 1170248190 |
| 17 | 5406570910 |
| 18 | 25068420955 |
| 19 | 116617923611 |
| 20 | 544157590706 |
| 21 | 2546278167018 |
| 22 | 11945937322413 |
| 23 | 56180864428301 |
| 24 | 264812677643417 |
| 25 | 1250853429148333 |
| 26 | 5920145717412047 |