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 | 1 |
| 2 | 4 |
| 3 | 17 |
| 4 | 74 |
| 5 | 323 |
| 6 | 1400 |
| 7 | 6005 |
| 8 | 25478 |
| 9 | 107015 |
| 10 | 445556 |
| 11 | 1841273 |
| 12 | 7561922 |
| 13 | 30897227 |
| 14 | 125714672 |
| 15 | 509767421 |
| 16 | 2061390206 |
| 17 | 8317305359 |
| 18 | 33498803948 |
| 19 | 134727010049 |
| 20 | 541232563130 |
| 21 | 2172291241811 |
| 22 | 8712410196584 |
| 23 | 34922863258757 |
| 24 | 139921580805494 |
| 25 | 560408087592983 |