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 | 8 |
| 2 | 36 |
| 3 | 164 |
| 4 | 750 |
| 5 | 3414 |
| 6 | 15504 |
| 7 | 70412 |
| 8 | 319532 |
| 9 | 1449895 |
| 10 | 6578528 |
| 11 | 29850070 |
| 12 | 135443522 |
| 13 | 614568094 |
| 14 | 2788573700 |
| 15 | 12653014693 |
| 16 | 57412388798 |
| 17 | 260505742646 |
| 18 | 1182031264628 |
| 19 | 5363405068469 |
| 20 | 24336170423291 |
| 21 | 110424101519685 |
| 22 | 501043586283665 |