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 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 34 |
| 5 | 48 |
| 6 | 48 |
| 7 | 0 |
| 8 | -163 |
| 9 | -548 |
| 10 | -1274 |
| 11 | -2340 |
| 12 | -3255 |
| 13 | -2224 |
| 14 | 5304 |
| 15 | 28560 |
| 16 | 82379 |
| 17 | 182300 |
| 18 | 322102 |
| 19 | 410700 |
| 20 | 133128 |
| 21 | -1295264 |
| 22 | -5440600 |
| 23 | -14733680 |
| 24 | -31384533 |
| 25 | -52870668 |
| 26 | -59633454 |
| 27 | 11449780 |
| 28 | 312532426 |
| 29 | 1137823168 |
| 30 | 2918752832 |
| 31 | 5961965824 |
| 32 | 9464314955 |