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) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 5 |
| 4 | 32 |
| 5 | 131 |
| 6 | 661 |
| 7 | 1327 |
| 8 | 18608 |
| 9 | 148969 |
| 10 | 447047 |
| 11 | 89422 |
| 12 | 1967410 |
| 13 | 7869871 |
| 14 | 102309709 |
| 15 | 204620705 |
| 16 | 2046213056 |
| 17 | 32739453941 |
| 18 | 556571077357 |
| 19 | 556571247527 |
| 20 | 10574855234543 |
| 21 | 42299423848079 |
| 22 | 42299425233749 |
| 23 | 84598851790183 |