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 | 3 |
| 2 | 9 |
| 3 | 23 |
| 4 | 61 |
| 5 | 155 |
| 6 | 401 |
| 7 | 1023 |
| 8 | 2629 |
| 9 | 6723 |
| 10 | 17241 |
| 11 | 44135 |
| 12 | 113101 |
| 13 | 289643 |
| 14 | 742049 |
| 15 | 1900623 |
| 16 | 4868821 |
| 17 | 12471315 |
| 18 | 31946601 |
| 19 | 81831863 |
| 20 | 209618269 |
| 21 | 536945723 |
| 22 | 1375418801 |
| 23 | 3523201695 |
| 24 | 9024876901 |
| 25 | 23117683683 |
| 26 | 59217191289 |
| 27 | 151687926023 |