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 | 17 |
| 1 | 51 |
| 2 | 153 |
| 3 | 459 |
| 4 | 1377 |
| 5 | 4131 |
| 6 | 12393 |
| 7 | 37179 |
| 8 | 111537 |
| 9 | 334611 |
| 10 | 1003833 |
| 11 | 3011499 |
| 12 | 9034497 |
| 13 | 27103491 |
| 14 | 81310473 |
| 15 | 243931419 |
| 16 | 731794257 |
| 17 | 2195382771 |
| 18 | 6586148313 |
| 19 | 19758444939 |
| 20 | 59275334817 |
| 21 | 177826004451 |
| 22 | 533478013353 |
| 23 | 1600434040059 |
| 24 | 4801302120177 |
| 25 | 14403906360531 |