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 | 0 |
| 2 | 218 |
| 3 | 876 |
| 4 | 3504 |
| 5 | 14016 |
| 6 | 56064 |
| 7 | 224256 |
| 8 | 897024 |
| 9 | 3588096 |
| 10 | 14352384 |
| 11 | 57409536 |
| 12 | 229638144 |
| 13 | 918552576 |
| 14 | 3674210304 |
| 15 | 14696841216 |
| 16 | 58787364864 |
| 17 | 235149459456 |
| 18 | 940597837824 |
| 19 | 3762391351296 |
| 20 | 15049565405184 |
| 21 | 60198261620736 |
| 22 | 240793046482944 |
| 23 | 963172185931776 |
| 24 | 3852688743727104 |