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 | 2 |
| 2 | 5 |
| 3 | 62 |
| 4 | 129 |
| 5 | 320 |
| 6 | 3969 |
| 7 | 8258 |
| 8 | 20485 |
| 9 | 254078 |
| 10 | 528641 |
| 11 | 1311360 |
| 12 | 16264961 |
| 13 | 33841282 |
| 14 | 83947525 |
| 15 | 1041211582 |
| 16 | 2166370689 |
| 17 | 5373952960 |
| 18 | 66653806209 |
| 19 | 138681565378 |
| 20 | 344016936965 |
| 21 | 4266884808958 |
| 22 | 8877786554881 |
| 23 | 22022457918720 |
| 24 | 273147281579521 |
| 25 | 568317021077762 |