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 | -2 |
| 3 | -3 |
| 4 | -4 |
| 5 | -4 |
| 6 | -1 |
| 7 | 9 |
| 8 | 34 |
| 9 | 89 |
| 10 | 200 |
| 11 | 409 |
| 12 | 779 |
| 13 | 1394 |
| 14 | 2339 |
| 15 | 3624 |
| 16 | 4974 |
| 17 | 5323 |
| 18 | 1682 |
| 19 | -13279 |
| 20 | -56222 |
| 21 | -163136 |
| 22 | -408768 |
| 23 | -943275 |
| 24 | -2059237 |
| 25 | -4310179 |
| 26 | -8712425 |
| 27 | -17072901 |
| 28 | -32486302 |
| 29 | -60006278 |
| 30 | -107341413 |
| 31 | -184979170 |
| 32 | -303998680 |
| 33 | -467127625 |
| 34 | -642495990 |
| 35 | -696247140 |