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 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 24 |
| 7 | 62 |
| 8 | 114 |
| 9 | 249 |
| 10 | 480 |
| 11 | 1022 |
| 12 | 1978 |
| 13 | 4094 |
| 14 | 8064 |
| 15 | 16348 |
| 16 | 32520 |
| 17 | 65534 |
| 18 | 130512 |
| 19 | 262142 |
| 20 | 523270 |
| 21 | 1048444 |
| 22 | 2095104 |
| 23 | 4194302 |
| 24 | 8384316 |
| 25 | 16777185 |
| 26 | 33546240 |
| 27 | 67108356 |
| 28 | 134201398 |
| 29 | 268435454 |
| 30 | 536837136 |
| 31 | 1073741822 |
| 32 | 2147418240 |
| 33 | 4294965244 |
| 34 | 8589803520 |