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 | 9 |
| 3 | 18 |
| 4 | 36 |
| 5 | 63 |
| 6 | 72 |
| 7 | 126 |
| 8 | 252 |
| 9 | 504 |
| 10 | 712 |
| 11 | 729 |
| 12 | 1458 |
| 13 | 1716 |
| 14 | 2136 |
| 15 | 2916 |
| 16 | 2982 |
| 17 | 3484 |
| 18 | 3588 |
| 19 | 4402 |
| 20 | 5103 |
| 21 | 5467 |
| 22 | 5832 |
| 23 | 7120 |
| 24 | 7332 |
| 25 | 8800 |
| 26 | 9798 |
| 27 | 9894 |
| 28 | 10206 |
| 29 | 10452 |
| 30 | 11928 |
| 31 | 12948 |
| 32 | 13192 |
| 33 | 13851 |
| 34 | 14952 |
| 35 | 17420 |
| 36 | 17608 |
| 37 | 17963 |