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 | 3 |
| 3 | 3 |
| 4 | 4 |
| 5 | 32 |
| 6 | 92 |
| 7 | 270 |
| 8 | 1262 |
| 9 | 3561 |
| 10 | 13976 |
| 11 | 48859 |
| 12 | 173602 |
| 13 | 622502 |
| 14 | 2233811 |
| 15 | 7882027 |
| 16 | 28343929 |
| 17 | 100832747 |
| 18 | 360076171 |
| 19 | 1284751998 |
| 20 | 4584944102 |
| 21 | 16356781324 |
| 22 | 58381988677 |
| 23 | 208293028674 |
| 24 | 743376640816 |
| 25 | 2652427350327 |
| 26 | 9465170814378 |