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 | 4 |
| 2 | 11 |
| 3 | 24 |
| 4 | 47 |
| 5 | 88 |
| 6 | 163 |
| 7 | 304 |
| 8 | 575 |
| 9 | 1104 |
| 10 | 2147 |
| 11 | 4216 |
| 12 | 8335 |
| 13 | 16552 |
| 14 | 32963 |
| 15 | 65760 |
| 16 | 131327 |
| 17 | 262432 |
| 18 | 524611 |
| 19 | 1048936 |
| 20 | 2097551 |
| 21 | 4194744 |
| 22 | 8389091 |
| 23 | 16777744 |
| 24 | 33555007 |
| 25 | 67109488 |
| 26 | 134218403 |
| 27 | 268436184 |
| 28 | 536871695 |
| 29 | 1073742664 |
| 30 | 2147484547 |
| 31 | 4294968256 |
| 32 | 8589935615 |