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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 10 |
| 6 | 15 |
| 7 | 20 |
| 8 | 30 |
| 9 | 52 |
| 10 | 78 |
| 11 | 96 |
| 12 | 144 |
| 13 | 282 |
| 14 | 423 |
| 15 | 420 |
| 16 | 630 |
| 17 | 1660 |
| 18 | 2490 |
| 19 | 1304 |
| 20 | 1956 |
| 21 | 11332 |
| 22 | 16998 |
| 23 | -3896 |
| 24 | -5844 |
| 25 | 95240 |
| 26 | 142860 |
| 27 | -157160 |
| 28 | -235740 |
| 29 | 983610 |
| 30 | 1475415 |
| 31 | -2634300 |
| 32 | -3951450 |
| 33 | 11751660 |
| 34 | 17627490 |
| 35 | -38381160 |
| 36 | -57571740 |
| 37 | 152461740 |
| 38 | 228692610 |