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 | 1 |
| 2 | 15 |
| 3 | 111 |
| 4 | 518 |
| 5 | 1789 |
| 6 | 5026 |
| 7 | 12166 |
| 8 | 26328 |
| 9 | 52221 |
| 10 | 96613 |
| 11 | 168861 |
| 12 | 281502 |
| 13 | 450905 |
| 14 | 697984 |
| 15 | 1048972 |
| 16 | 1536256 |
| 17 | 2199273 |
| 18 | 3085467 |
| 19 | 4251307 |
| 20 | 5763366 |
| 21 | 7699461 |
| 22 | 10149854 |
| 23 | 13218514 |
| 24 | 17024440 |
| 25 | 21703045 |
| 26 | 27407601 |
| 27 | 34310745 |
| 28 | 42606046 |
| 29 | 52509633 |
| 30 | 64261884 |
| 31 | 78129176 |