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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 33 |
| 5 | 121 |
| 6 | 378 |
| 7 | 1065 |
| 8 | 2803 |
| 9 | 7045 |
| 10 | 17148 |
| 11 | 40789 |
| 12 | 95373 |
| 13 | 220065 |
| 14 | 502414 |
| 15 | 1136977 |
| 16 | 2553831 |
| 17 | 5699149 |
| 18 | 12645504 |
| 19 | 27914877 |
| 20 | 61337665 |
| 21 | 134213065 |
| 22 | 292547346 |
| 23 | 635430937 |
| 24 | 1375724763 |
| 25 | 2969559381 |
| 26 | 6392110468 |
| 27 | 13723752805 |
| 28 | 29393671413 |
| 29 | 62813884465 |
| 30 | 133949278998 |
| 31 | 285078439329 |
| 32 | 605590372303 |