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 | 4 |
| 2 | 5 |
| 3 | 34 |
| 4 | 78 |
| 5 | 335 |
| 6 | 968 |
| 7 | 3556 |
| 8 | 11245 |
| 9 | 38986 |
| 10 | 127662 |
| 11 | 433015 |
| 12 | 1437072 |
| 13 | 4833924 |
| 14 | 16125205 |
| 15 | 54068594 |
| 16 | 180718798 |
| 17 | 605223135 |
| 18 | 2024416088 |
| 19 | 6776576996 |
| 20 | 22673534845 |
| 21 | 75884451226 |
| 22 | 253927226542 |
| 23 | 849793486215 |
| 24 | 2843728075552 |
| 25 | 9516580935684 |