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 | 3 |
| 3 | 8 |
| 4 | 29 |
| 5 | 111 |
| 6 | 522 |
| 7 | 2604 |
| 8 | 14459 |
| 9 | 85796 |
| 10 | 544753 |
| 11 | 3659313 |
| 12 | 25902251 |
| 13 | 192171887 |
| 14 | 1489090036 |
| 15 | 12011329453 |
| 16 | 100583184087 |
| 17 | 872346402439 |
| 18 | 7819597099285 |
| 19 | 72313198682817 |
| 20 | 688784601395670 |
| 21 | 6747614973580663 |
| 22 | 67896777481378196 |
| 23 | 700913648767703716 |
| 24 | 7415270780191604414 |
| 25 | 80316990564932960558 |