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 | 4 |
| 2 | 12 |
| 3 | 30 |
| 4 | 72 |
| 5 | 130 |
| 6 | 204 |
| 7 | 294 |
| 8 | 400 |
| 9 | 522 |
| 10 | 660 |
| 11 | 814 |
| 12 | 984 |
| 13 | 1170 |
| 14 | 1372 |
| 15 | 1590 |
| 16 | 1824 |
| 17 | 2074 |
| 18 | 2340 |
| 19 | 2622 |
| 20 | 2920 |
| 21 | 3234 |
| 22 | 3564 |
| 23 | 3910 |
| 24 | 4272 |
| 25 | 4650 |
| 26 | 5044 |
| 27 | 5454 |
| 28 | 5880 |
| 29 | 6322 |
| 30 | 6780 |
| 31 | 7254 |
| 32 | 7744 |
| 33 | 8250 |
| 34 | 8772 |
| 35 | 9310 |
| 36 | 9864 |
| 37 | 10434 |
| 38 | 11020 |
| 39 | 11622 |
| 40 | 12240 |
| 41 | 12874 |
| 42 | 13524 |
| 43 | 14190 |
| 44 | 14872 |
| 45 | 15570 |
| 46 | 16284 |
| 47 | 17014 |
| 48 | 17760 |
| 49 | 18522 |
| 50 | 19300 |