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 | 21 |
| 2 | 61 |
| 3 | 141 |
| 4 | 377 |
| 5 | 1001 |
| 6 | 2737 |
| 7 | 7553 |
| 8 | 21073 |
| 9 | 59217 |
| 10 | 167441 |
| 11 | 475793 |
| 12 | 1357637 |
| 13 | 3887541 |
| 14 | 11165509 |
| 15 | 32152901 |
| 16 | 92802433 |
| 17 | 268398401 |
| 18 | 777651553 |
| 19 | 2256800033 |
| 20 | 6558953917 |
| 21 | 19087539437 |
| 22 | 55614451789 |
| 23 | 162219429293 |
| 24 | 473648632141 |