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 | 1 |
| 3 | 9 |
| 4 | 8 |
| 5 | 71 |
| 6 | 63 |
| 7 | 559 |
| 8 | 496 |
| 9 | 4401 |
| 10 | 3905 |
| 11 | 34649 |
| 12 | 30744 |
| 13 | 272791 |
| 14 | 242047 |
| 15 | 2147679 |
| 16 | 1905632 |
| 17 | 16908641 |
| 18 | 15003009 |
| 19 | 133121449 |
| 20 | 118118440 |
| 21 | 1048062951 |
| 22 | 929944511 |
| 23 | 8251382159 |
| 24 | 7321437648 |
| 25 | 64962994321 |
| 26 | 57641556673 |
| 27 | 511452572409 |
| 28 | 453811015736 |
| 29 | 4026657584951 |
| 30 | 3572846569215 |