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 | 0 |
| 3 | 3 |
| 4 | 4 |
| 5 | 15 |
| 6 | 12 |
| 7 | 63 |
| 8 | 72 |
| 9 | 207 |
| 10 | 290 |
| 11 | 979 |
| 12 | 864 |
| 13 | 4095 |
| 14 | 5250 |
| 15 | 13485 |
| 16 | 16496 |
| 17 | 65535 |
| 18 | 69948 |
| 19 | 262143 |
| 20 | 240000 |
| 21 | 888888 |
| 22 | 1319758 |
| 23 | 4106167 |
| 24 | 3318144 |
| 25 | 16199225 |
| 26 | 22355866 |
| 27 | 56730861 |
| 28 | 66385676 |
| 29 | 266917769 |
| 30 | 267331800 |
| 31 | 1073741823 |
| 32 | 1073809184 |
| 33 | 3481794591 |
| 34 | 5726404746 |
| 35 | 16262257795 |