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) |
|---|---|
| 1 | 6 |
| 2 | 26 |
| 3 | 76 |
| 4 | 218 |
| 5 | 664 |
| 6 | 2174 |
| 7 | 7452 |
| 8 | 26130 |
| 9 | 92512 |
| 10 | 328774 |
| 11 | 1170052 |
| 12 | 4166106 |
| 13 | 14836488 |
| 14 | 52839374 |
| 15 | 188188396 |
| 16 | 670240802 |
| 17 | 2387095600 |
| 18 | 8501764310 |
| 19 | 30279479508 |
| 20 | 107841961962 |
| 21 | 384084839128 |
| 22 | 1367938434910 |
| 23 | 4871984975932 |
| 24 | 17351831789874 |
| 25 | 61799465313024 |