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) |
|---|---|
| 2 | 7 |
| 3 | 30 |
| 4 | 85 |
| 5 | 204 |
| 6 | 451 |
| 7 | 954 |
| 8 | 1969 |
| 9 | 4008 |
| 10 | 8095 |
| 11 | 16278 |
| 12 | 32653 |
| 13 | 65412 |
| 14 | 130939 |
| 15 | 262002 |
| 16 | 524137 |
| 17 | 1048416 |
| 18 | 2096983 |
| 19 | 4194126 |
| 20 | 8388421 |
| 21 | 16777020 |
| 22 | 33554227 |
| 23 | 67108650 |
| 24 | 134217505 |
| 25 | 268435224 |
| 26 | 536870671 |
| 27 | 1073741574 |
| 28 | 2147483389 |
| 29 | 4294967028 |
| 30 | 8589934315 |
| 31 | 17179868898 |
| 32 | 34359738073 |
| 33 | 68719476432 |