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) |
|---|---|
| 5 | 1 |
| 6 | 2 |
| 7 | 7 |
| 8 | 23 |
| 9 | 77 |
| 10 | 256 |
| 11 | 861 |
| 12 | 2897 |
| 13 | 9800 |
| 14 | 33232 |
| 15 | 113012 |
| 16 | 385165 |
| 17 | 1315434 |
| 18 | 4500398 |
| 19 | 15421463 |
| 20 | 52919299 |
| 21 | 181826880 |
| 22 | 625467087 |
| 23 | 2153816295 |
| 24 | 7423887771 |
| 25 | 25611710370 |
| 26 | 88430103927 |
| 27 | 305555059139 |
| 28 | 1056532822348 |
| 29 | 3655607694207 |
| 30 | 12656112780583 |
| 31 | 43841784746311 |