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 | -1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | 1 |
| 7 | -1 |
| 8 | 13 |
| 9 | -16 |
| 10 | -39 |
| 11 | 76 |
| 12 | 122 |
| 13 | -365 |
| 14 | -64 |
| 15 | 537 |
| 16 | 1103 |
| 17 | -1565 |
| 18 | -6850 |
| 19 | 6630 |
| 20 | 38704 |
| 21 | -58273 |
| 22 | -108054 |
| 23 | 204722 |
| 24 | 366920 |
| 25 | -598506 |
| 26 | -1526994 |
| 27 | 1111475 |
| 28 | 9656314 |
| 29 | -7254090 |
| 30 | -43224847 |
| 31 | 39704799 |
| 32 | 171028427 |
| 33 | -177129071 |
| 34 | -604754108 |