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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 3 |
| 4 | -3 |
| 5 | -15 |
| 6 | -27 |
| 7 | -32 |
| 8 | -30 |
| 9 | -30 |
| 10 | -42 |
| 11 | -66 |
| 12 | -90 |
| 13 | -101 |
| 14 | -99 |
| 15 | -99 |
| 16 | -117 |
| 17 | -153 |
| 18 | -189 |
| 19 | -206 |
| 20 | -204 |
| 21 | -204 |
| 22 | -228 |
| 23 | -276 |
| 24 | -324 |
| 25 | -347 |
| 26 | -345 |
| 27 | -345 |
| 28 | -375 |
| 29 | -435 |
| 30 | -495 |
| 31 | -524 |
| 32 | -522 |
| 33 | -522 |
| 34 | -558 |
| 35 | -630 |
| 36 | -702 |
| 37 | -737 |
| 38 | -735 |
| 39 | -735 |
| 40 | -777 |
| 41 | -861 |
| 42 | -945 |
| 43 | -986 |
| 44 | -984 |
| 45 | -984 |
| 46 | -1032 |
| 47 | -1128 |
| 48 | -1224 |
| 49 | -1271 |
| 50 | -1269 |
| 51 | -1269 |
| 52 | -1323 |
| 53 | -1431 |