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 | 0 |
| 2 | 0 |
| 3 | 7 |
| 4 | 45 |
| 5 | 225 |
| 6 | 709 |
| 7 | 1974 |
| 8 | 4524 |
| 9 | 9614 |
| 10 | 18382 |
| 11 | 33425 |
| 12 | 56895 |
| 13 | 93447 |
| 14 | 146715 |
| 15 | 224280 |
| 16 | 331814 |
| 17 | 480844 |
| 18 | 679724 |
| 19 | 945099 |
| 20 | 1288737 |
| 21 | 1733725 |
| 22 | 2296065 |
| 23 | 3006762 |
| 24 | 3886960 |
| 25 | 4977210 |
| 26 | 6304794 |
| 27 | 7921589 |
| 28 | 9862099 |
| 29 | 12191459 |
| 30 | 14952567 |
| 31 | 18225900 |
| 32 | 22064010 |
| 33 | 26564952 |
| 34 | 31792280 |