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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 41 |
| 5 | 24 |
| 6 | 231 |
| 7 | 924 |
| 8 | 341 |
| 9 | 2684 |
| 10 | 69761 |
| 11 | 68785 |
| 12 | 210802 |
| 13 | 9247 |
| 14 | 444762 |
| 15 | 5484969 |
| 16 | 7675353 |
| 17 | 97446921 |
| 18 | 7836774 |
| 19 | 913627671 |
| 20 | 240214656 |
| 21 | 2076266442 |
| 22 | 4636528419 |
| 23 | 56316950343 |
| 24 | 4237414099821 |
| 25 | 2541046491684 |
| 26 | 25127035376381 |
| 27 | 40061905533596 |
| 28 | 63057159747362 |