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 | 4 |
| 2 | 6 |
| 3 | 4 |
| 4 | 21 |
| 5 | 24 |
| 6 | 92 |
| 7 | 156 |
| 8 | 498 |
| 9 | 1096 |
| 10 | 3210 |
| 11 | 8052 |
| 12 | 22913 |
| 13 | 61320 |
| 14 | 173088 |
| 15 | 478316 |
| 16 | 1351983 |
| 17 | 3798240 |
| 18 | 10781954 |
| 19 | 30585828 |
| 20 | 87230157 |
| 21 | 249056136 |
| 22 | 713387076 |
| 23 | 2046590844 |
| 24 | 5884491500 |
| 25 | 16945772208 |
| 26 | 48883660146 |
| 27 | 141214768972 |