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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 6 |
| 5 | 10 |
| 6 | 20 |
| 7 | 1 |
| 8 | 36 |
| 9 | 172 |
| 10 | 2192 |
| 11 | 3371 |
| 12 | 1 |
| 13 | 22327 |
| 14 | 135561 |
| 15 | 517656 |
| 16 | 284492 |
| 17 | 933118 |
| 18 | 5446991 |
| 19 | 24265724 |
| 20 | 18238138 |
| 21 | 93800069 |
| 22 | 334654476 |
| 23 | 1368408363 |
| 24 | 2584589232 |
| 25 | 1823879615 |
| 26 | 25669818480 |
| 27 | 41583822879 |
| 28 | 1967330543 |
| 29 | 29409700520 |
| 30 | 1265785403 |
| 31 | 3239855363874 |