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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 577 |
| 7 | 2208 |
| 8 | 6768 |
| 9 | 17469 |
| 10 | 39603 |
| 11 | 81272 |
| 12 | 154225 |
| 13 | 274802 |
| 14 | 464985 |
| 15 | 753556 |
| 16 | 1177362 |
| 17 | 1782687 |
| 18 | 2626731 |
| 19 | 3779196 |
| 20 | 5323979 |
| 21 | 7360972 |
| 22 | 10007969 |
| 23 | 13402680 |
| 24 | 17704852 |
| 25 | 23098497 |
| 26 | 29794227 |
| 27 | 38031696 |
| 28 | 48082149 |
| 29 | 60251078 |
| 30 | 74880985 |
| 31 | 92354252 |
| 32 | 113096118 |