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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 48 |
| 7 | 115 |
| 8 | 286 |
| 9 | 719 |
| 10 | 1842 |
| 11 | 4766 |
| 12 | 12486 |
| 13 | 32973 |
| 14 | 87811 |
| 15 | 235381 |
| 16 | 634847 |
| 17 | 1721159 |
| 18 | 4688676 |
| 19 | 12826228 |
| 20 | 35221832 |
| 21 | 97055181 |
| 22 | 268282855 |
| 23 | 743724984 |
| 24 | 2067174645 |
| 25 | 5759636510 |
| 26 | 16083734329 |
| 27 | 45007066269 |
| 28 | 126186554308 |
| 29 | 354426847597 |