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) |
|---|---|
| 3 | 7 |
| 4 | 23 |
| 5 | 56 |
| 6 | 120 |
| 7 | 241 |
| 8 | 467 |
| 9 | 886 |
| 10 | 1660 |
| 11 | 3087 |
| 12 | 5715 |
| 13 | 10552 |
| 14 | 19452 |
| 15 | 35825 |
| 16 | 65943 |
| 17 | 121342 |
| 18 | 223240 |
| 19 | 410663 |
| 20 | 755391 |
| 21 | 1389448 |
| 22 | 2555664 |
| 23 | 4700673 |
| 24 | 8645963 |
| 25 | 15902486 |
| 26 | 29249316 |
| 27 | 53797967 |
| 28 | 98949979 |
| 29 | 181997480 |
| 30 | 334745652 |
| 31 | 615693345 |