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 | 0 |
| 1 | 2 |
| 2 | 10 |
| 3 | 44 |
| 4 | 178 |
| 5 | 740 |
| 6 | 2868 |
| 7 | 11852 |
| 8 | 47522 |
| 9 | 190104 |
| 10 | 735842 |
| 11 | 3090116 |
| 12 | 11777124 |
| 13 | 48557252 |
| 14 | 194656036 |
| 15 | 778669672 |
| 16 | 3117617996 |
| 17 | 12677727330 |
| 18 | 49850271300 |
| 19 | 192901051976 |
| 20 | 795560529352 |
| 21 | 3243898094388 |
| 22 | 12977884832332 |
| 23 | 51055591319170 |