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 | 6 |
| 2 | 16 |
| 3 | 36 |
| 4 | 76 |
| 5 | 156 |
| 6 | 316 |
| 7 | 636 |
| 8 | 1276 |
| 9 | 2556 |
| 10 | 5116 |
| 11 | 10236 |
| 12 | 20476 |
| 13 | 40956 |
| 14 | 81916 |
| 15 | 163836 |
| 16 | 327676 |
| 17 | 655356 |
| 18 | 1310716 |
| 19 | 2621436 |
| 20 | 5242876 |
| 21 | 10485756 |
| 22 | 20971516 |
| 23 | 41943036 |
| 24 | 83886076 |
| 25 | 167772156 |
| 26 | 335544316 |
| 27 | 671088636 |
| 28 | 1342177276 |
| 29 | 2684354556 |
| 30 | 5368709116 |
| 31 | 10737418236 |
| 32 | 21474836476 |