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 | 3 |
| 3 | 5 |
| 4 | 12 |
| 5 | 24 |
| 6 | 56 |
| 7 | 123 |
| 8 | 291 |
| 9 | 677 |
| 10 | 1637 |
| 11 | 3954 |
| 12 | 9757 |
| 13 | 24171 |
| 14 | 60648 |
| 15 | 152929 |
| 16 | 388822 |
| 17 | 993216 |
| 18 | 2551808 |
| 19 | 6582899 |
| 20 | 17055507 |
| 21 | 44341141 |
| 22 | 115671498 |
| 23 | 302627130 |
| 24 | 793951897 |
| 25 | 2088103609 |
| 26 | 5504504961 |
| 27 | 14541271283 |
| 28 | 38489869502 |
| 29 | 102066761622 |
| 30 | 271122837895 |