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 | 4 |
| 2 | 14 |
| 3 | 41 |
| 4 | 122 |
| 5 | 364 |
| 6 | 1093 |
| 7 | 3280 |
| 8 | 9842 |
| 9 | 29525 |
| 10 | 88574 |
| 11 | 265720 |
| 12 | 797161 |
| 13 | 2391484 |
| 14 | 7174454 |
| 15 | 21523361 |
| 16 | 64570082 |
| 17 | 193710244 |
| 18 | 581130733 |
| 19 | 1743392200 |
| 20 | 5230176602 |
| 21 | 15690529805 |
| 22 | 47071589414 |
| 23 | 141214768240 |
| 24 | 423644304721 |