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 | 4 |
| 3 | 7 |
| 4 | 22 |
| 5 | 42 |
| 6 | 127 |
| 7 | 249 |
| 8 | 746 |
| 9 | 1476 |
| 10 | 4414 |
| 11 | 8766 |
| 12 | 26215 |
| 13 | 52158 |
| 14 | 156041 |
| 15 | 310799 |
| 16 | 930194 |
| 17 | 1854072 |
| 18 | 5550976 |
| 19 | 11070000 |
| 20 | 33152042 |
| 21 | 66139316 |
| 22 | 198115526 |
| 23 | 395368914 |
| 24 | 1184511095 |
| 25 | 2364457980 |
| 26 | 7084871668 |
| 27 | 14145343660 |
| 28 | 42390336619 |