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) |
|---|---|
| 5 | 10 |
| 6 | 37 |
| 7 | 130 |
| 8 | 453 |
| 9 | 1584 |
| 10 | 5577 |
| 11 | 19786 |
| 12 | 70720 |
| 13 | 254524 |
| 14 | 921842 |
| 15 | 3357908 |
| 16 | 12294995 |
| 17 | 45229500 |
| 18 | 167093505 |
| 19 | 619689690 |
| 20 | 2306312580 |
| 21 | 8611143420 |
| 22 | 32246815350 |
| 23 | 121085968380 |
| 24 | 455817192090 |
| 25 | 1719872196432 |
| 26 | 6503354706762 |
| 27 | 24640476660420 |
| 28 | 93534587913648 |
| 29 | 355675196682904 |