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 | 3 |
| 2 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 45 |
| 6 | 104 |
| 7 | 246 |
| 8 | 590 |
| 9 | 1447 |
| 10 | 3582 |
| 11 | 8864 |
| 12 | 22216 |
| 13 | 55989 |
| 14 | 141738 |
| 15 | 360486 |
| 16 | 920892 |
| 17 | 2360953 |
| 18 | 6073160 |
| 19 | 15664216 |
| 20 | 40510215 |
| 21 | 105017120 |
| 22 | 272821646 |
| 23 | 710143301 |
| 24 | 1851830021 |
| 25 | 4836984396 |
| 26 | 12653549540 |
| 27 | 33148606878 |
| 28 | 86954036990 |
| 29 | 228373959896 |
| 30 | 600482317125 |
| 31 | 1580587864193 |
| 32 | 4164596465439 |
| 33 | 10983396620288 |