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 | 5 |
| 4 | 12 |
| 5 | 32 |
| 6 | 92 |
| 7 | 278 |
| 8 | 877 |
| 9 | 2861 |
| 10 | 9572 |
| 11 | 32656 |
| 12 | 113164 |
| 13 | 397190 |
| 14 | 1409006 |
| 15 | 5043617 |
| 16 | 18194197 |
| 17 | 66075777 |
| 18 | 241385044 |
| 19 | 886422017 |
| 20 | 3270283189 |
| 21 | 12115355601 |
| 22 | 45052126049 |
| 23 | 168100964161 |
| 24 | 629171367473 |
| 25 | 2361546968519 |
| 26 | 8886942571534 |
| 27 | 33523357596518 |
| 28 | 126736969302857 |