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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 30 |
| 7 | 66 |
| 8 | 161 |
| 9 | 376 |
| 10 | 954 |
| 11 | 2350 |
| 12 | 6061 |
| 13 | 15612 |
| 14 | 41067 |
| 15 | 108374 |
| 16 | 289800 |
| 17 | 778064 |
| 18 | 2105739 |
| 19 | 5723190 |
| 20 | 15638235 |
| 21 | 42890100 |
| 22 | 118098876 |
| 23 | 326217628 |
| 24 | 903897631 |
| 25 | 2511285360 |
| 26 | 6994836250 |
| 27 | 19527701960 |
| 28 | 54632961864 |
| 29 | 153147864380 |
| 30 | 430095282258 |
| 31 | 1209924870900 |