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 | 16 |
| 2 | 68 |
| 3 | 296 |
| 4 | 1300 |
| 5 | 5728 |
| 6 | 25268 |
| 7 | 111512 |
| 8 | 492196 |
| 9 | 2172592 |
| 10 | 9590180 |
| 11 | 42332936 |
| 12 | 186866356 |
| 13 | 824867584 |
| 14 | 3641141012 |
| 15 | 16072772984 |
| 16 | 70948650820 |
| 17 | 313182494032 |
| 18 | 1382454408452 |
| 19 | 6102448992488 |
| 20 | 26937513095764 |
| 21 | 118907935627168 |
| 22 | 524885022092660 |
| 23 | 2316954583165784 |