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 | 152 |
| 6 | 292 |
| 7 | 552 |
| 8 | 1052 |
| 9 | 2052 |
| 10 | 4104 |
| 11 | 8344 |
| 12 | 17044 |
| 13 | 34664 |
| 14 | 69904 |
| 15 | 139808 |
| 16 | 278108 |
| 17 | 552268 |
| 18 | 1098148 |
| 19 | 2189908 |
| 20 | 4379816 |
| 21 | 8776356 |
| 22 | 17596496 |
| 23 | 35263836 |
| 24 | 70598516 |
| 25 | 141197032 |
| 26 | 282208592 |
| 27 | 563931612 |
| 28 | 1127077552 |
| 29 | 2253369432 |
| 30 | 4506738864 |
| 31 | 9015534644 |