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 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 26 |
| 4 | 39 |
| 5 | 77 |
| 6 | 177 |
| 7 | 359 |
| 8 | 977 |
| 9 | 1977 |
| 10 | 3659 |
| 11 | 13659 |
| 12 | 28879 |
| 13 | 128879 |
| 14 | 289978 |
| 15 | 999663 |
| 16 | 4474997 |
| 17 | 14474997 |
| 18 | 39596964 |
| 19 | 139596964 |
| 20 | 389999999 |
| 21 | 1389999999 |
| 22 | 2899999999 |
| 23 | 12899999999 |
| 24 | 49999999986 |
| 25 | 149999999986 |
| 26 | 446874999996 |
| 27 | 1446874999996 |